I got only this message:
It’s a Polish version of the Windows info: “The filename, directory name, or volume label syntax is incorrect.”
When I am bundling HTML5 it gives a path to game.projectc0
Not pointing out anything and not giving much info 
There were a lot of changes since last bundling, any ideas how could I find the issue easily? 
My guess is that it is the colon in the path name that is the problem.
It is! Thank you so much @britzl! 
I changed Title in game.project to Witchcrafter_Empire_Legends and it bundled 
Could it be that Windows bundling is also showing that path?
That’s great! I think the following characters should be avoided for filenames on Windows: <>:"/|?*
