Quicktime & M4A File Can't Open "Unidentified Developer"

Discussion in 'Mac Basics and Help' started by adamjackson, Dec 16, 2016.

  1. adamjackson macrumors 65816

    Jul 9, 2008
    • MacBook Pro 15" El-Capitan (Latest Public OS Release)
    • iCloud Drive
    • File Located on iCloud / Desktop / Reviews (folder)
    • File called New Recording 6.m4a at 3.8 Megabytes
    • iCloud Drive fully synchronized

    I get this when I double click:

    If I open Quicktime player in Applications by Right Click / Open, I get no window and then I can do Apple+O and choose the file and it opens fine.

    Any reason this would happen? It's a file recorded by Voice Memos on iOS and saved to iCloud Drive.
    --- Post Merged, Dec 16, 2016 ---
    Info Window:

  2. Kissmyne macrumors 6502


    Apr 21, 2015
    To resolve this issue, control+ click on the file that you are getting this prompt with, and select open from the menu that becomes available, you will get a prompt similar to the one driving your initial post, however there will be an "Open" option, after you click that.. you will not be prompted again(typically) for that file. Please be aware that macOS updates may trigger this prompt in the future.
  3. Nermal Moderator


    Staff Member

    Dec 7, 2002
    New Zealand
    I've run into this too. You'd think it would only block actual executable files, but I've had it block plain text files too...
  4. Kissmyne macrumors 6502


    Apr 21, 2015
    It makes sense that they do this, especially with the prevalence of malware infested attachments and file extensions being hidden when it comes to Windows machines(which macs are designed to run alongside)
  5. adamjackson thread starter macrumors 65816

    Jul 9, 2008
    Yes. I did this and that's how I opened each of the files eventually.

    My question is. This is an Apple feature (iCloud Drive). and the files opened just fine yesterday. Something happened overnight to cause this w/o any re-syncing.

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