identifying macOS folders that are considered to be files?

[kee nethery]

Is there any way for LiveCode to tell me that a macOS folder that gets listed with “the folders” is actually treated as a file? For example, .app is a file where View Package Contents is an option but the OS treats it as a single thing. Same with .numbers, .pages, and various other “files”. They can be opened up and the contents can be viewed.

Is there any way to know which “folders” are actually treated by the OS as files? 

Thanks,
Kee Nethery