Frequently asked questions (FAQ)
We created these documents to answer the most commonly-asked and repeated questions that users asked to us and to help you solving some computer related problems. Please check these FAQs before asking questions either to us via email.
Please note, that we currently don't provide personal support to solve all specific user problems with files due to specializing in the first place to maintenance of File-Extensions.org's database content.
In some cases, especialy if there is no information about desired file extension you search for, we can help to find appropriate information and publish it to our website for all readers and also inform you after site update.
- Search file extensions from Windows context menu - Directly search File-Extensions.org's database by single click from Windows context menu upon an unknown file
- Show and hide file extensions in Windows 10
- Show and hide file extensions in Windows 11
- Show and hide file extensions in Windows 8.1
General information resources related to file extensions
- Basic information about computer files and file extensions - What is computer filename? What is a file extension?
- Additional information about file extensions - Detailed information about computer file extensions: usage, history, alternatives, improvements
- File extension issues - File association and file format conflicts, security related issues, file naming and file transfer problems information
- File extensions under Windows
- File extensions on MAC - Information about file extensions in Apple's Mac OS X operating system
- File-extensions.org's direct search features - Directly search for file extension information
- The most common file formats used in P2P (peer-to-peer) networks
- Three ways how to identify uknown files - Solving the origin of mysterious files
Common and most frequently asked questions related to file extensions
- Opening unknown file types under Windows - What to do, when Windows does not know file type I want to open?
- Why I can't send or receive some files via email? - Forbidden file extensions for certain file types in email attachments
- Associating program to any file extension - Creating custom file extensions and setting to a default program
- Change default application for file name extension on Mac - Using Apple Finder to change change default application for file type
- Change file extension of multiple files in Windows - Rename file extension of multiple files with Windows command line, Total Commander or Multi-File Renamer.
- Fix broken EXE associations - Repairing executable assoaciation changed by malware with FixExec program
- How long file extension can be? - Historical nuances and convections about files and their extensions
- How to associate a file type in Windows - Changing file extension associations for various programs in Windows
- How to associate a file with a program in Windows - An overview about file type association in various versions of Windows operating system
- How to clear default apps in Android - Change the default app to open file in Google Android
- How to enable or disable application set as the default program - Information about the default program feature in Microsoft Windows
- How to hide file extensions in the Mac OS X - Two ways how to hide or show file extensions in Mac OS Finder
- How to hide known file extensions in Windows - Hidding known file extensions in Windows
- How to manage default programs in Windows - Changing default programs for various file extensions in Windows
- How to show hidden file extensions in Windows 7 - Showing hidden file extensions in Windows 7 and Vista
- Manage file associations on Mac - Manage file associations and other related system settings with RCDefaultApp for Mac.
- Quickly change file extension of multiple files - Batch renaming of file extensions
- Restore default program associations - Fixing broken file assocations
- Set default app for opening files with no extension on Mac - Set the default software for opening files without file extension with RCDefaultApp
- Set default program for files with no extension in Windows - Associating files with no extension to a default program
FAQ and resources for software and file type/format developers
- I'm a developer, can I register my own file extension? - For developers: How to submit a file extension name to File-Extensions.org's database
Files related tips and tricks
- Batch rename multiple files on Mac - Use NameChanger app, or muCommander to batch rename multiple files and file extensions
- Generate a directory listing or file list in Windows - creating directory and file listing with Windows Command Line, Total Commander and Directory List & Print utility
- How to add Show/Hide known file extension toggle in Windows - Adding a handy file extension option to context menu in Windows
- How to change default Windows temp folder - Changing the default temporary folder location
- How to change the default Windows documents folder - Changing default location of document folder
- How to quickly rename large number of files - Batch renaming of files in Windows and Mac OS X
- How to remove programs from the Open With menu in Explorer - Cleaning up Open With program menu
- How to restrict certain file types in Windows Group Policy - Administrate rights for files based on their extension in Windows Server
- How to search in Mac App Store by the file extension - Searching for programs, opening unknown file types under MAC OS X using Apple Mac App store
- How to use the window title bar in Mac OS X - Check the little hidden feature in Mac OS X 10.8. and higher
- Map SkyDrive as network drive - Work with SkyDrive as network drive in Windows without any 3rd party program.
- Restore icon cache in Windows - Repair Windows icon cache database without any third party software
File type categories articles
- Identifying unknown file formats - A guide to file format analyze
- Basic info how to convert accounting and tax files - Converting and exporting of financial data files.
- Basic info how to convert archives and compressed files - Converting archives and compressed files.
- Basic info how to convert audio and music files - Converting audio and song files.
- Basic info how to convert backup files - Converting backup files.
- Basic info how to convert bitmap or raster images - Converting images and pictures.
- Basic info how to convert CAD and other 3D graphic files - Converting 3D graphic or CAD files.
- Basic info how to convert databases - Converting databases.
- Basic info how to convert disk images - Converting disk backups.
- Basic info how to convert documents - Converting and exporting documents.
- Basic info how to convert emulator files - Converting emulator files.
- Basic info how to convert font files - Converting fonts.
- Basic info how to convert game files - Converting game files.
- Basic info how to convert GIS, GPS or map files - Converting and exporting of Geographic Information Systems files.
- Basic info how to convert source code or script files - Converting scripts and source files.
- Basic info how to convert spreadsheet files - Converting or exporting spreadsheets and workbooks.
- Basic info how to convert text files - Converting text file types.
- Basic info how to convert vector graphics files - Converting vector graphics files.
- Basic info how to convert video and movie files - Converting video and movie files.
- Basic info how to open accounting and tax files - Opening and importing of financial data files.
- Basic info how to open audio and music files - Opening and playing audio and song files.
- Basic info how to open backup files - Opening backup files.
- Basic info how to open bitmap or raster images - Opening images and pictures.
- Basic info how to open CAD and other 3D graphic files - Opening 3D graphics and CAD files
- Basic info how to open databases - Opening databases.
- Basic info how to open disk images - Opening disk backups.
- Basic info how to open documents - Opening and editing document files
- Basic info how to open emulator files - Opening emulator files.
- Basic info how to open font files - Opening and viewing of font files.
- Basic info how to open game files - Opening game files.
- Basic info how to open GIS, GPS or map files - Opening and importing of Geographic Information Systems files.
- Basic info how to open or extract archives and compressed files - Opening and extracting archives and compressed files.
- Basic info how to open source code or script files - Opening of scrip and source code files.
- Basic info how to open spreadsheet files - Opening workbooks and spreadsheets.
- Basic info how to open text files - Opening text file types.
- Basic info how to open vector graphics files - Opening vector graphic files.
- Basic info how to open video and movie files - Opening and playing video and movie files.
- How to convert Microsoft Office documents - Saving Office files to other file formats.
- How to open Microsoft Office documents - Opening of Microsoft Office files.