File Extension Database
Search our comprehensive file extension database to discover the format of an unknown file and find programs that can open it.
Inside our database, you’ll find:
- 20,000+ file extensions
- 8,000+ software tool
- 10,000+ file converters
Tips for Opening Unknown File Formats
What is a file extension?
A file extension is the string of characters that follows the last dot in a filename. It helps your operating system determine which program can open the file. For example, «.txt» is used for plain text files.
How can I look up file extension info?
Use the search box to find the extension you’re curious about. Each result includes a detailed description and a list of software that supports the format.
How do I open an unknown file?
Select your operating system from the list and download one of the suggested programs. If the file extension is associated with a tool, double-clicking it may open the file automatically.
Top Extensions This Week
- 1 .VMC - Windows Virtual Machine Configuration Format
- 2 .CUE - Cue Sheet Format
- 3 .PHP5 - PHP 5 Web Page
- 4 .TAB - MapInfo TAB Format
- 5 .HTM - Hypertext Markup Language Format
- 6 .RTF - Rich Text Format
- 7 .PSK - Unreal Engine Skeletal Mesh Format
- 8 .R20 - Norton Ghost Rar
- 9 .BVH - Biovision Hierarchy Animation Format
- 10 .MBX - Outlook Express Mailbox
Popular Software Tools
- 1 Microsoft Streets & Trips (10 file associations)
- 2 Eclipse (75 file associations)
- 3 Turbo Pascal (13 file associations)
- 4 Adobe Captivate (12 file associations)
- 5 Microsoft Outlook (85 file associations)
- 6 Microsoft Excel (123 file associations)
- 7 Unreal Tournament (1999) (16 file associations)
- 8 Autodesk Stitcher Unlimited (14 file associations)
- 9 iPhoto (26 file associations)
- 10 Aimersoft DVD Ripper (17 file associations)
Recommended File Converters
- 1 MP4 to WEB (10 program)
- 2 TXT to PDF (22 program)
- 3 AAC to WMA (11 program)
- 4 M4A to OGG (11 program)
- 5 TIFF to PDF (23 program)
- 6 MPG to AVI (24 program)
- 7 FLA to FLAC (13 program)
- 8 XXX to PEC (13 program)
- 9 MOV to FLV (16 program)
- 10 PDF to BMP (14 program)
Browse extensions by category
- 3D Image Files
- Audio Files
- Backup Files
- Compressed Files
- Configuration Files
- Data Files
- Database Files
- Developer Files
- Document Files
- Executable Files
- Font Files
- Game Files
- GIS Files
- Graphics Files
- Plugin Files
- Raster Image Files
- Settings Files
- Spreadsheet Files
- System Files
- Temporary Files
- Text Files
- Vector Image Files
- Video Files
- Web Files