Japanese file names are not properly supported on Lightroom 3.5.
Certain jpg files with Japanese file names are not imported into Lightroom.
Exact problematic characters are not identified.
This may or may not be related to files with "Comment" meta data that are visible on Windows Explorer.
Japanese people (and others who have non-ascii characters in their paths/filenames) may also have problems using plugins. Lua functions like dofile need to be enhanced to support all languages and computer systems.