Dude. I had this problem. I had non-english characters in game path. Try another folder. All games with second 32bit .exe now playable for me.
Whatever I do, this article comes across
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I'm sorry, but an uncaught exception occurred.
After loading the script.
UnicodeDecodeError: 'utf8' codec can't decode byte 0xc0 in position 7: invalid start byte
-- Full Traceback ------------------------------------------------------------
Full traceback:
File "renpy/bootstrap.py", line 326, in bootstrap
File "renpy/main.py", line 461, in main
File "renpy/persistent.py", line 223, in init
File "/home/tom/ab/nightly-build/tmp/install.linux-x86_64/lib/python2.7/ntpath.py", line 85, in join
UnicodeDecodeError: 'utf8' codec can't decode byte 0xc0 in position 7: invalid start byte