Spyro YOTD

[jimbob]

I am new to patching psx games until now... I bought YOTD and need to patch it. I am not unfamiliar with making image files and/or cd copies. I downloaded the patch wizard101 talked about at megagames.com
After reading a couple of days about patching I have a couple of questions.
1. the file I downloaded had a .p4u extension. What patch engine should I use?
2. Where can I learn/read how to patch it?