Thanks, Timo. I wonder what the prepending //?/ stuff is good for, apparently it's not needed for UTF-16 file names.
Here is another test: extract the files to C:\ or whatever your Masm32 drive is so that you get
C:\Masm32\MasmBasic\Res\Let's have some fun with an incredibly long folder name that clearly exceeds the official MAX_PATH limitation imposed by Windows 7 and other not so recent versions of Windows that could possibly be present on a computer\MyLongTest.asc
Then open the *.asc file in RichMasm and hit F6.