Re: [w3ctag/design-reviews] Limit allowed "accepted" extensions in File System Access API file pickers. (#580)

Sorry for the slow reply.  The current list of characters is indeed fairly arbitrary. I think I originally did include most of what you're asking about (going of the wikipedia list), but got some push back that without clear use cases it was better to be as minimal as possible (because who knows what characters might have special meaning on particular file systems/operating systems). I agree that + is a bit of an odd one out in that regard. I believe I mostly went by what was in the freedesktop.org shared-mime-info database, which does include .c++, but none of the other characters (so yes, most linux installations will treat .c++ files as the same mime type as .cpp and .cc, and thus have the same applications associated with them). 

I'd be fine with adding the rest, although so far nobody has asked for them yet.

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