Than it is a 'yes' to answer 2 ;)

run validateInstallation.bat found in your RTW folder and pose your results here, so I can see what files were changed!
Did the mentioned 'other mod for RTW' change any files in the vanilla directory? Run Vanilla and see if the textures are also gone wild.

If we can find the files you need I gladly upload them so you doesn't have to make a complete roll-over.

XSamatan