Right-click the (or Step 7) desktop shortcut. Select Run as Administrator .

If you have access to another PC with a working installation of the same Step 7 version: s7yomlr.dll (or similar files like s7yomlra.dll for specific languages) from the C:\Program Files\siemens\step7\s7bin folder of the working PC. Paste it into the same directory on the affected machine.

Cannot Find Language Resource File S7yomlr.dll

Right-click the (or Step 7) desktop shortcut. Select Run as Administrator .

If you have access to another PC with a working installation of the same Step 7 version: s7yomlr.dll (or similar files like s7yomlra.dll for specific languages) from the C:\Program Files\siemens\step7\s7bin folder of the working PC. Paste it into the same directory on the affected machine.