terminal – Mac doesn’t not accept to create folder name “.service” on Finder

Using Visual Studio I created a Project in a folder named “something.Service” It works file without problem. The same happens if I export this project to a Windows machine.

When I look on it via Finder the folder has an extension called “.app” and it is not accessible via Finder.

When I try to access this folder via Terminal there is no problem.

On this print screen, I show this discrepancy on Finder and Terminal

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Why I can’t use this Name on Finder?