A powerful, free alternative to Microsoft Office that can open and edit almost any document, spreadsheet, or presentation format (including legacy files).

Instead, here is an "interesting post" on why FileViewPro is popular and how you can manage your files safely: The "Swiss Army Knife" of Files

Are there specific you're struggling to open right now?

The gold standard for opening almost any video or audio format (MKV, FLAC, OGG, etc.) that Windows Media Player can't handle.

If you have a file and have no idea what it is, try . You can search for the file extension (the letters after the dot, like .dat or .cfg), and it will tell you exactly what program created it and how to open it for free.