Either try using the Change Disc command to change to the same disc (File-> Change Disc), or use an ISO tool to make an image and replace all the STR files with blank or short STR files. Use a PS movie player to find a suitably short STR video on any PSX game, as I am unsure if a blank file would cause problems. Missing filenames on the disc WILL cause problems, however. If you are on a PAL version, good luck getting the later method to work...I guess you could patch after making the image, then replace the STR files.
You might also want to consider using a memory hack to help you get that Excalibur 2 by setting your game time to a fixed value below the limit. Google for PEC if you need a program to help you do this, as there is probably already a code for it in the database.
You might also want to consider using a memory hack to help you get that Excalibur 2 by setting your game time to a fixed value below the limit. Google for PEC if you need a program to help you do this, as there is probably already a code for it in the database.