Are you trying to in a Vocaloid program, or are you looking to manually play the audio stored inside this archive?
: Likely audio snippets, metadata, or temporary files for a Voicebank Preview . YVMPREVIEW.7z
: Right-click the file and select "Extract to YVMPREVIEW/" . Are you trying to in a Vocaloid program,
: If the file is 0KB or throws an error when opening, it may be a locked temporary file currently in use by a Yamaha background process. YVMPREVIEW.7z