i have the same issue !
used a blank map and now my content folder is empty no nothing just an empty content folder and the file i imported that works fine, but it if I go and try and save WHAM ! A file/folder may not match any of the following :
CON, PRN, AUX, CLOCK$, NUL, NONE,
COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9,
LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, or LPT9. i get this error and I can’t save it