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  • I'll check that out. Commented Feb 19, 2019 at 17:04
  • 2
    I've tried that but I didn't success. SupportedTypes is a key? What .mp4 should be? Another key? Would you please develop your answer in detail?
    – cdlvcdlv
    Commented Mar 22, 2019 at 17:20
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    @cdlvcdlv Just check the other registry items for reference. For example mspaint.exe.
    – Tara
    Commented Oct 23, 2019 at 11:15
  • Came here looking for Word (Office). The program name was winword.exe. Simply adding a string value ".pdf" made word appear in open with context menu. Computer\HKEY_CLASSES_ROOT\Applications\WINWORD.EXE\SupportedTypes Commented Jul 27, 2023 at 14:56