Using a COBY MP3 USB player MP-C827 which is a USB flash drive on steroids (meaning it's a simple/primitive player!) and was trying to copy some MP3 files to it...XY wouldn't copy the full name and gave me the "Select Filename" dialog...so..looked at drive properties, and XY reported file system "Unknown", so that is why the copy failed...ok, but Win Expl reports the drive as FAT32 and had no problem with the copy...
BTW, I'll be out of town for next 3 days so my access here will be spotty.
XYplorer Beta Club