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I think this is a BUG in the 1.3.1 version. Because I use "ClassicShell" on Windows 8.1 somehow I got two "Play PR" links. One is working, the other one is not. The reason why the "other" one is not working is because if you right click it it points to the PRLauncher but it does NOT say where to run it.
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The empty line in "Ausf?hren in" has to say:
"Drive Letter:\yourPath To Game\Project Reality\mods\pr\bin"
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This problem occured on installing the 1.3.1 update, before that everything was running fine. Thank god it's an easy fix.
Thanks.