Like in the title. I'm trying to save the game migrated from 0.16.51, and I'm not able to use capital Z in the filename. Lowercase 'z' seems to work just fine. No idea what other characters could be affected.
Message I get:
Character "Z" can't be part of the file name.
UPDATE: The problem persists even in new (non-migrated) game.
[0.17.0] Can't use capital 'Z' in save name
[0.17.0] Can't use capital 'Z' in save name
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- factorio-current.log
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Re: [0.17.0] Can't use capital 'Z' in save name
Thanks for the report.
Fixed for 0.17.1
Fixed for 0.17.1
Re: [0.17.0] Can't use capital 'Z' in save name
I'd be more than happy to hear how did that happen 
Re: [0.17.0] Can't use capital 'Z' in save name
Simple c < 'Z' instead of c <= 'Z'
Re: [0.17.0] Can't use capital 'Z' in save name
There are three hard problems in computer science: naming things, and off-by-one errors. 