Right clicking on a file that has a Japanese name and selecting "send to mail recipient" garbles the file name. This happens on multiple Windows 7 Ultimate PCs that are using English, but have the Japanese language/keyboard installed.
It is not that it does not appear in the new email window that pops up, it is just that it does not have the correct name. The file will even open, it is just the multi-byte name that gets garbled. (see screenshot)
I've duplicated this issue on a different PC.