If game path contain spaces Steam ignoring it when you adding Non-Steam game and game will not run because of this.
Try to add and run Unigine Valley for example (Windows version via Proton). Game folder contain spaces: Valley Benchmark 1.0
Valley Benchmark 1.0
How it look like when you adding Unigine Valley:
How it MUST look like when you adding Unigine Valley:
Hello @tim77, this issue is already being tracked at #5220. Closing as a duplicate.
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Please describe your issue in as much detail as possible:
If game path contain spaces Steam ignoring it when you adding Non-Steam game and game will not run because of this.
Steps for reproducing this issue:
Try to add and run Unigine Valley for example (Windows version via Proton). Game folder contain spaces:
Valley Benchmark 1.0How it look like when you adding Unigine Valley:

How it MUST look like when you adding Unigine Valley:
