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LyseCandle
Participant
July 20, 2026
Answered

Windows describes Premiere Pro as "Unknown Application"

  • July 20, 2026
  • 1 reply
  • 12 views

I want to set it up so that certain video files always open Premiere Pro, including MP4 and MOV files. Unfortunately, whenever I try to select premiere pro as the default application, the system calls it “unknown application” and doesn’t work. I have to open Premiere Pro, start a project, and THEN add the file, which is a couple more steps than I really want to deal with when I’m simply organizing my thoughts for a project with videos I have on hand. 
Has anyone else run into this problem? Is it truly an Adobe issue, or should I be nagging Microsoft about it? I don’t understand why this occurs with only Premiere Pro as well because I have no problems with Photoshop, illustrator, or Lightroom. Just Premiere Pro.
Thank you for any help anyone can provide and please let me know if I can elaborate if needed.

    Correct answer PaulMurphy

    Thanks for the detailed description. This one isn't a bug on either side. Premiere Pro opens only one type of file, its own project file (.prproj). That is why Windows will not accept it as the default application for video files like MP4 or MOV.

    1 reply

    PaulMurphyCommunity ExpertCorrect answer
    Community Expert
    July 20, 2026

    Thanks for the detailed description. This one isn't a bug on either side. Premiere Pro opens only one type of file, its own project file (.prproj). That is why Windows will not accept it as the default application for video files like MP4 or MOV.

    LyseCandle
    Participant
    July 21, 2026

    Well crud. Thank you for explaining this though because it was driving me a bit bonkers.