SHIFT_JIS filenames cannot be read in UTF8 Mode

[lightbinder]

The root cause of this bug is simple -- in our new UTF8 Mode, a UTF8 aware filesystem and UTF8 encoded filenames are assumed. However, compressed archives (like arc.nsa) that were originally compressed in a SHIFT_JIS file system will continue to have SHIFT_JIS filenames. The solution is to make sure that a conversion to SHIFT_JIS is tried if the UTF8 equivalent is not found.