(The instructions I made was from the use of PJ64, however they are very similair to the instructions for the 1964)
Make sure your current plugin is "Rice's Video Plugin 6.1.1 beat 10."
Go to "Configure Graphics Pugin..."
In the "General Options" tab, uncheck "Hide Advanced Options."
In the "Texture Filters" tab, check "Dump textures to files."
Click "OK."
Play game.
The game might become a bit slower. The textures will be added to a folder when the textures on-screen are shown. Trying to recieve all textures in the game would take awhile.
Close down the Emulator/Program.
Go to:
My Computer >> Local Disk (C

>> Program Files >> Project 64 1.6 >> Plugin >> texture_dump >> [The name of the game you dumped the texures in]
The textures would be there, which could be used for re-texturing.