The solutions for all the machines is as followed:
As first I had to change the node in following screen:
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After I change it to RDP.File, originally it was Devolutions inc..Remote Desktop Manager.rdp The Edit is not back yet.
After this I had to do what you sad as last:
Than all I had to do was exit regedit.exe and the problem was fixed!
I did this on the machines that needed the fix and it still works.
Awsome and Thank you very much for the good and fast help!
+1 to Devolutions Forum!
As first I had to change the node in following screen:

After I change it to RDP.File, originally it was Devolutions inc..Remote Desktop Manager.rdp The Edit is not back yet.
After this I had to do what you sad as last:
Could you try right-click on an .rdp file and select "Open with" -> Chose default program then re-select Remote Desktop Connection (MSTSC.exe), does it work now?
Than all I had to do was exit regedit.exe and the problem was fixed!
I did this on the machines that needed the fix and it still works.
Awsome and Thank you very much for the good and fast help!
+1 to Devolutions Forum!