When you work with many documents, photos, backups, or prepare a Data migration between Windows and Linux systemsOne of the key pieces is knowing what type of file each one is and how it's stored on the system. It's not enough to just look at the extension: sometimes it's missing, incorrectly formatted, or you're simply dealing with external drives and partitions whose format you don't even know.
In this context, having quick methods to identify the file type (and also the type of file system) makes all the difference: it helps you decide what to migrate, what to exclude, where to store it on the new computer, and how to recover information from damaged or poorly organized drives, both in Windows and Linux.
Windows migration planning: file types and locations
Before moving anything from one team to another, it is essential to be clear What types of files, folders, and settings will be migrated?This is especially important when automatic configuration files such as MigDocs.xml (typical of Microsoft migration tools) and you have to decide it manually.
The first step is to identify the standard paths where users save their documentsThese include the folder Documentsroutes such as C:\Data and also company-defined network locations, for example a shared resource like \\EngineeringDrafts or other common folders. These are usually the "official" areas where working files are stored.
Next, you need to locate the non-standard locationsThese are the trickiest because every user has their own quirks. This includes personal folders on other partitions, frequently connected external drives, or unusual paths within the system disk itself. In these areas, you need to decide three things: what types of files are allowed, which folders are excluded, and what new location they will be moved to on the destination computer.
Choosing which file types to include and exclude
When preparing for a migration, it is advisable to draw up a clear list of file types to be included and those to be excludedThis list is usually based on the applications used in the organization. Each program works with specific file extensions, which helps you separate what's important from what's unnecessary.
For example, Microsoft Word primarily uses extensions .doc, .docx y .dotx for documents and templates, although it also handles other less common types such as the old .dotSimilarly, Excel uses .xls, .xlsx, .xltxPowerPoint, .ppt, .pptxetc. From here, you can decide that everything that is an office document, image, PDF or project file is migrated, while temporary files, logs, or installers Perhaps you're not interested in dragging them into the new environment.
At this point it is also useful to identify what file types do key applications use From the company: engineering software, graphic design, video editing, ERPs… This way you can explicitly include these extensions in the migration rules and ensure that nothing important is left behind, even if the user has saved it outside of the standard folders.
Folders and paths that should be excluded
Just as important as selecting what to copy is deciding Which locations are excluded from the migrationIn Windows, there are certain system paths that don't make sense to move to another machine because they are recreated when reinstalling the operating system or applications.
Among the most typical exclusions are the directory %WINDIR% (the Windows installation folder) and Program files (so much C:\Program Files , the C:\Program Files (x86)It is also advisable to exclude folders with temporary data, browser caches, downloaded installation files, and any content that can be regenerated without loss of important information.
This way you focus solely on the real user data (documents, photos, databases, projects…)avoiding moving gigabytes of files that only get in the way and may even cause conflicts in the new environment.
Define the new locations in the target system
Once it is clear what is being migrated and from where, it is necessary to define where those files will be stored on the destination computerYou have several possible strategies: send everything to the folder Documents From the new profile, use a folder structure specifically designated for migrated data or try to reproduce the same path they had on the source computer.
In some environments, for example, it may be desirable for shared data that was originally on a user's computer to be moved to a centralized network resourceor that certain documents that were previously isolated outside the user profile are redirected to more organized paths. These decisions are usually defined in the migration design phase and can be implemented through location redirection rules in tools such as the USMT (User State Migration Tool).
To make good decisions, it is very useful to review in advance what file types that users handle in their daily work And where they actually store them. Sometimes you think everything's in Documents, and then a treasure trove of critical files turns up in a forgotten folder at the root of C: or on a USB drive that only gets plugged in occasionally.
How to view registered file types in Windows
On modern Windows systems you can quickly check What types of files are registered and which application opens them by default?This gives you an overview of the formats used on the team.
To do this, follow these steps in a recent version of Windows:
- Right-click on the start menu and enters Configuration.
- In the Settings window, access the section Applications.
- Inside, select Default applications.
- Scroll down and tap Choose default values by file type (or a similar option depending on the version).
- Windows will display a list with all registered file extensions and associated program.
This list serves as an "inventory" of formats recognized in the system and can help you decide which extensions have real relevance in your data migration or audit, beyond what users themselves may tell you.
File system fundamentals: Windows, Linux, and compatibility
Beyond each specific file, it should not be forgotten that All data resides on a file system determined, and that conditions both the compatibility between platforms and the tools you can use to analyze them.
For example, a USB drive formatted with ext4 (a typical Linux file system) cannot be read natively in Windows without installing additional software. In contrast, NTFS or exFAT disks work naturally in Windows, and most Linux distributions also handle them without issue.
Linux stands out for supporting a wide variety of file systems: ext, ext2, ext3, ext4, hpfs, iso9660, JFS, minix, msdos, ncpfs, NFS, NTFS, proc, ReiserFS, SMB, sysv, vfat, XFS, xiafs, and many more. In these systems, virtually everything is represented as a file. text, images, devices, sockets, links…nothing is spared.
Data, metadata and inodes in Linux
In Linux file systems, information is usually conceptually separated into two blocks: on one side there are the User Data, which contain the actual content of the files, and on the other hand the Metadata, which describe those files. This metadata is stored in structures called inodes.
An inode stores information such as the file name, type, permissions, owner, group, size, creation and modification datesas well as details about hard and symbolic links and their location within the directory hierarchy. Thanks to this metadata, the system can efficiently manage what's in each part of the disk without having to constantly read all the content.
Quick methods to identify the file system in Linux
For many administrative tasks (mounting disks, recovering data, migrating, or diagnosing errors) it is vital to know which file system you are trying on each partitionIn Linux there are several very effective commands to find this out at a glance.
1. df command: disk usage and file system type
The command df (Disk Filesystem) It is mainly used to view the occupied and free space on mounted file systems, but with the appropriate parameters it also shows you the type of each one.
Running something like df -Th (often with sudo for high privileges In certain cases, you will obtain a table where one of the columns is precisely the “Type”, which indicates whether the partition is ext4, xfs, vfat, ntfsetc. If you're only interested in viewing block devices (/dev), you can combine it with grep:
sudo df -Th | grep /dev
You can also ask df that I tell you the file system of a specific pathfor example, the partition where it is hosted /boot:
df -Th /boot
2. fsck command with simulation option
The command fsck It's used to check the integrity of a file system and repair it if errors are found. However, with the right option, it can also tell you what type of system it is without touching anything.
Using fsck -N /dev/sda o fsck -N /dev/sdb1 (The The -N option indicates "do not execute" mode(i.e., simulate), you'll see what verification program it would use internally (fsck.ext4, fsck.vfat, etc.), which reveals the type of file system on that partition without taking any risks.
3. The lsblk command to view block devices and their attributes
The command lsblk It displays detailed information about all block devices detected on the system (disks, partitions, logical volumes, etc.). It's a very practical tool for having a complete view of the storage structure.
If you run lsblk -f o lsblk -fsYou will see data for each device such as the label, UUID, and the filesystem type (FSTYPE). This view is very clear for locating at a glance which partition is ext4, which is vfat, which is ntfs, etc., and how they relate to each other (for example, which partitions belong to the same physical disk).
4. Mount command: what is mounted and where
The command mount It's used to mount file systems, whether local disks, network drives, or ISO images. However, if you run it without parameters, it will show you all currently mounted file systems on your machine.
Combining it with grep to filter by devices /dev, for example with mount | grep "/dev"You'll get a list with the device, mount point, and file system type being used. It's another quick way to identify the format of each volume you're currently using.
5. blkid command: low-level device information
The command blkid It is intended to display information about block devices, such as file system type, UUID, and other properties that are often used in /etc/fstab or in volume management tools.
With an order like blkid /dev/sda You'll see if that partition is, for example, ext4, ntfs, vfat, swapetc. It is especially useful when you want to edit persistent mount configurations and need to know precisely what is on each device, without having to mount it first.
6. The `file` command to recognize file systems on disks
The command file It is primarily known for identifying the type of any file, but with the right combination of parameters it can also help you to recognize the type of file system on a partition.
Applied to normal files, for example file DSC_0627.JPGIt will tell you something like “JPEG image data” with details of resolution and format. To analyze a partition, you can use file -sL /dev/sda1 (often with sudo (front), where -s indicates that it should read the contents of the device and -L indicates that it should follow symbolic links. if any.
Thus, file It will tell you if that partition appears to be an ext4 system, a partition table, an LVM volume, etc. In some cases, it also identifies if the device contains, for example, an encrypted volume.
The `file` command in Linux: identifying file types by content
The command file It is a fundamental tool in GNU/Linux. When you encounter files without extensions, with dubious extensions, or when you want to go beyond what the name suggests. Unlike systems that rely almost exclusively on the extension, file It analyzes the internal content of the file to determine what type it actually belongs to.
This is especially useful for system administrators and advanced users This is especially useful for those working with backups, files downloaded from unreliable sources, or datasets with untrustworthy names. Furthermore, it allows you to quickly detect whether something that appears to be plain text is actually a binary file, a script, an image, or even a disguised executable.
Basic syntax and common options
The general way to use it is very simple: file You can pass one or more files in a row and the command will return one line of information for each one.
Among the most used options are:
-b: displays only the file type, without repeating the name in front.-i: returns the MIME type and encoding, which helps integrate it with other programs.-L: follows symbolic links and directly analyzes the file they point to.--help: offers a summary of options and quick help.
The output of file It is usually very descriptive: it doesn't just say "text" or "image", but offers details about the specific format, architecture, and executable type and other data that allows you to better understand what you are dealing with.
Practical examples of use in GNU/Linux
If you call file documento.txtYou will see a description similar to “ASCII text” or “UTF-8 Unicode text”. This way you can check if a text file It is in the expected encoding or if it's a binary file that you shouldn't open with a simple editor.
You can analyze multiple files in the same order, For example: file archivo1.png archivo2.zip archivo3The utility will return a line with the type for each one: PNG image data, Zip archive data, ELF executable, etc., very practical when inspecting batches of files at the same time.
If you're only interested in knowing the nature of the file without seeing the name, the option -b It will only show you the description. For example: uterine file -b script.sh might say “Bourne-Again shell script, ASCII text executable”.
The option -i allows you to obtain the MIME type and encodingThis is especially useful when working with web servers or scripts that need to make decisions based on the MIME type. A typical example would be: file -i imagen.jpg, which could return “image/jpeg; charset=binary”.
When you're dealing with a symbolic link, the default behavior of file It's about identifying the link itself. If you want it to look directly at the original file, add -L: file -L enlace It will display target information, not symlink information, which is much more practical in most cases.
Furthermore, file is able to recognize compressed files and its headersWhen analyzing a .tar.gz It will tell you that it is data compressed with gzip and often the original name of the TAR file and the modification date recorded inside the container.
Using File in Windows: Identifying files without extensions
On Linux, the command file It's almost a classic for identifying file typesHowever, Windows lacks a native tool that analyzes content rather than file extension. Fortunately, ported versions of GNU utilities bring this functionality to the Microsoft environment.
A typical case where they come in handy is when, after a problem with an external hard drive, you resort to data recovery toolsOften these programs recover files without a clear name or extension, leaving a large number of "mystery" files that you don't know if they are photos, documents, executables, or something else.
In Linux, it would be enough to use file to find out what each one is, and with a GNU port You can do the same in WindowsThe procedure usually involves downloading the corresponding package, installing it or adding it to the PATH, and then launching the command from a console (CMD or PowerShell) pointing to the files you want to analyze.
Once you've identified the type, all that's left is for you to do is Manually assign the appropriate extension. For example, yes file indicates that a file is "PE32 executable"; normally it is a .exeIf it shows “Zip archive data”, it is most likely a .zip; “JPEG image data” would correspond to a .jpg; “ASCII text” or “UTF-8 Unicode text” to a .txt; “Audio file with ID3” to a .mp3; “Macromedia Flash Video” to a .flvand so on.
In case that file If it says something like “ELF 32-bit LSB executable, Intel 80386”, what you have in front of you is a Linux executableNot from Windows. In that case, you don't need to add an extension (it's not essential in Linux) and you certainly won't be able to run it natively on Windows, unless you resort to WSL, virtual machines, or other similar workarounds.
Searching by file type in Linux with graphical interfaces
For many years, one of the recurring complaints of newcomers to Linux was the almost total dependence on the console for basic tasks, including searching for files. To find a lost document, the classic method involved commands like find, locate o grepPowerful but not very user-friendly for someone who just wants to locate an invoice or a photo.
The Linux desktop has evolved a lot and today It is not essential to "type" commands For quick searches, several graphical applications offer experiences similar to the instant search tools in Windows or macOS, allowing you to filter by name, type, location, and in some cases even by the internal content of documents; and preview tools such as QuickLook for Windows They facilitate visual identification without opening each file.
FSearch: Extreme speed in the style of Everything
FSearch It's one of the go-to brands when you're looking for pure, unadulterated speed. It's clearly inspired by... Everything for Windows and offers real-time results, which appear instantly as you type in the search box.
Its engine is extremely fast because it works on a indexed databaseHowever, for it to work properly, you need to access its preferences and specify which folders it should index (for example, Documents, Downloads, external drives, etc.). Once you've done that, you can use it to locate files of any type almost instantly, taking advantage of filters by name, extension, or patterns.
Albert: Multifunctional launcher and search engine
Albert It's more than a file search engine: it functions as a macOS Spotlight-style launcherYou activate it with a keyboard shortcut and, from that floating bar, you can run applications, perform quick operations, launch internet searches and, of course, locate files.
To get the most out of it, you'll need to spend a few minutes configuring it, specifically activating the add-on for file search in the settings. Once set up, it allows you to search by name or pattern and open locations without having to navigate tree by tree in the file manager, a very convenient shortcut for everyday use.
Catfish: fault-tolerant searches
Catfish It is a veteran tool that stands out for its fuzzy searchIt can find what you're looking for even if you don't remember the exact file name or make a typo. It's ideal for users who want something simple yet effective, without too much hassle.
This tolerance for errors is very useful when you only remember part of the name, an approximate word, or a mix of uppercase and lowercase letters. Catfish usually returns relevant results even if you don't get it right when typing, making it a very welcome companion for everyday searches.
Snoop: Search within content (with limitations)
Snoop It differs from the rest by focusing on text searches within documentsThis is especially useful if you don't remember the file name but do remember a specific phrase or fragment it contains.
However, its limitations must be understood: it is only capable of analyzing plain text files (.txt)He doesn't quite understand more complex formats like .odt nor binary files. Furthermore, it can sometimes list hidden system files that you're not interested in. Even so, it's a very useful tool for quickly locating notes or raw text documents.
Index and performance management in Linux versus Windows
These graphical search tools greatly speed up the work, but it's important to know what you can expect from them. Except for specific cases like SnoopMost focus on indexing file names and paths, not the internal content of documents.
When you need to search a sentence within a PDF, Word document, or presentationYou will still need more specific utilities or office suites with internal search, because lightweight desktop tools do not usually index all content by default.
There are also important differences in the Resource management between Windows and LinuxIn Windows, search system indexing often runs quite aggressively in the background and can sometimes consume significant resources; furthermore, there are managers that allow FreeCommander XE automate and control file-based tasks to limit their impact.
Thanks to this more flexible approach, you can achieve a better balance. speed of search and use of resources, adjusting each tool to your real needs without overloading the system with unnecessary indexing.
This entire set of techniques and tools—from the use of the command fillet in Linux and its Windows versions, including file system detection with utilities such as df, lsblk, blkid or fsck— even graphical search applications like FSearch, Albert, Catfish and Snoop — allow you to handle much more easily any scenario in which you need to identify file types or file systems in Windows and Linux, whether to migrate data, recover files from damaged disks or simply organize your documents. Share the information so that other users can learn about the topic.