I'm having the same issue. Running Win7 64bit
Hi, I'm looking into this. I'm guessing it's because the last Windows build of Playscii was built from my Windows 10 desktop with a version of PyInstaller (the program I use to turn my Python into a runnable Windows EXE) that changed something about its compat status. I no longer have access to any machines running Windows 7. I'm going to search PyInstaller's issue tracker thoroughly and file a ticket with them if I don't find anything.
Obviously Windows 7 is no longer an officially supported-by-MS OS but I'd like to exhaust every other option before I tell everyone Playscii for Windows requires win10.
Sure, see these two sections from the documentation, which is also accessible from within Playscii if you press F1: http://vectorpoem.com/playscii/howto_art.html#customcharsets
Creating a custom character set is a bit trickier than creating a custom palette, but that should explain what's needed.