I have that issue I cannot work out:
I can't enter / access folders or files when a name has polish fonts.
BTW FC do not show polish fonts, please have a look at printscreen

in windows explorer you can see there are polish fonts

What is interesting FreeCommander XE hasn't that issue...
I have regional settings and language set to polish.
I'd be very grateful for any help.
Cheers
Janosik