Beta testers wanted. Attached is a replacement for MIDI2LR.exe (it's in the archive as MIDI2LR.rename, as Google Groups doesn't allow exe uploads--rename to MIDI2LR.exe prior to use).
Replace the MIDI2LR.exe file in the plugin with this (save the old MIDI2LR.exe somewhere to test it. Please try it out on a path that includes Unicode characters.
This uses a new feature in C++ (filesystem) that is intended to manage the differences between operating systems when it comes to Unicode handling. OSX compiler (XCode) doesn't have filesystem yet, so this can't be tested on Macs.
Thanks for your help.