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Discover everything you need to know about file extensions

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Software Compatibility

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Discover alternative file formats with similar features when you need more compatibility.

Frequently Asked Questions


Common Questions

Everything you need to know about file extensions

A file extension is a suffix added to the end of a filename that indicates its type and format. For example, .docx indicates a Microsoft Word document.

Check the file extension and use the appropriate software indicated on our site. We provide compatibility information for Windows, Mac, and Linux.

On Windows, file extensions are not case sensitive, unlike macOS and Linux. Always check the exact extension.

Try other software suggested on the file extension page. Some files may require specific software or codecs.