How do I associate an "unknown file type" to a program?


  1. jimmyrustles
    Posts : 10
    Windows 7 Ultimate x64
       New #1

    How do I associate an "unknown file type" to a program?


    Long story short, I used Handbrake to add soft subtitles to some video clips and the finished result are "unknown file types" which I have to open with vlc every time, the "Always use the selected program to open this kind of file box is greyed out.

    The first file is a .m4v file and Handbrake also had the same output setting for the other files, but they're considered unknown by Windows. Pictured.

    Anyone know of a fix?
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  3. DavidE
    Posts : 6,330
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
       New #2

    Try renaming one of the .m4v files to .mp4 and see what that does.
    Read more at M4V File Extension - Open .M4V Files
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  4. jimmyrustles
    Posts : 10
    Windows 7 Ultimate x64
    Thread Starter
       New #3

    DavidE said:
    Try renaming one of the .m4v files to .mp4 and see what that does.
    Read more at M4V File Extension - Open .M4V Files

    You legend, it worked. Thanks!
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  6. DavidE
    Posts : 6,330
    Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
       New #4

    You're welcome and glad to hear that works.
    Thanks for posting back and marking the thread solved!
    :)
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