here's what ya do...
1) download Pj64
2) open note pad
3) go file/open
4) goto your PJ64 directory
5) In the file name space type *.rbd
6) The file you see double click it
7) Search the text for you game name
8) If you game is under the playable or mostly playable section it works, if not then it doesn't work.
Fun eh?