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ProgDataDir$ = GetUserDirectory(#PB_Directory_AllUserData)
Debug(ProgDataDir$) displays /Library/Application Support/

CreateDirectory(ProgDataDir$ + "MyApp") result is 0 which I suspect is due to permissions as permission is denied when I use mkdir in Terminal app without sudo.

How can PB app create a new directory in /Library/Application Support/ ?

macOS Catalina 10.15.4 PB572

Normale you should write into ~/Libary/Application Support/, which is your personal folder.
If you want into the main folder you need Admin privileges.

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