When I upgraded my Mac G5 from OS 10.3 to OS 10.4, the OS X versions of
Maple (Maple 9.5 and Maple 10) continued to work. But the classic
versions of Maple (Maple 7 and Maple Vr5) quit working. It turns out
that the classic versions will run in OS 10.4 if the following files
(perhaps from an old "System Folder") are moved into the "Extensions"
folder of the active classic OS 9 "System Folder":

OpenGLEngine
OpenGLUtility
OpenGLRendererATI
OpenGLRenderer
OpenGLMemory
OpenGLLibrary
Shared Library Manager PPC

At least this worked for me.