Source: VORC
KbMediaPlayer which supports OPX and, when using the MSXPlug plugin, KSS, BGM, MPK and MGS formats, has been updated to version 2.34 beta 3. This is the Japanese vesion. The English version has been updated to version 2.33.
Relevant links:
KbMediaPlayer English v2.33
KbMediaPlayer Japanese v2.34b3