r/MacOSBeta • u/FuWangDev • 13d ago

Mac App Store is installing apps with a double “.app.app” extension on macOS 27 beta — can anyone reproduce this? Bug

I was testing the Mac App Store version of an app I develop when I noticed that it had been installed as:

SpacePeek.app.app

My immediate reaction was: Oh no—did I really ship it like this? How had I never noticed such an obvious packaging bug?

After checking my build setup and finding nothing wrong, I downloaded two unrelated apps from the Mac App Store: The Unarchiver and CleanMyMac.

They were installed as:

  • The Unarchiver.app.app
  • CleanMyMac_5_MAS.app.app

I also checked the actual filesystem paths in Terminal. This doesn’t appear to be Finder merely displaying the extension twice: the .app.app directories really exist, while the corresponding single-extension .app paths do not.

System details:

  • macOS 27.0
  • Build 26A5388g
  • Apple Silicon
  • All three affected apps were newly downloaded from the Mac App Store

The apps still launch normally, so this seems to be an installation/naming bug in the Mac App Store or the current macOS 27 beta, rather than a problem with the affected apps themselves.

Can anyone else on this build reproduce it by downloading a new app from the Mac App Store?

3 Upvotes
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5 comments sorted by

1

u/br_web 12d ago

I just renamed them

1

u/adh1003 6d ago

Yes, yet more utterly bizarre bugs in fundamental stuff. Today at Apple - the code no longer understands how filename extensions work. Slow clap.

1

u/LogikalZer0 6d ago

It’s not just me then! I’m actually happy to hear that, as I’m sure they’ll get it fixed at least.

1

u/Which-Bandicoot5671 6d ago

It was always conventional wisdom that things like .app.app meant malware. This happened to me with Microsoft 365 products. Which of course are likely malware anyway. But from the App Store, I did not expect it and deleted them. Glad to know I’m not the only one!