The pak_muppet_sounds.pk3 file you have requested: Modifications / Muppet / MUPPET - Sounds - 25.2mb is not available. Perhaps try browsing all files for the game Return To Castle Wolfenstein and upload any files you want to share or are missing. This is the only information we could locate:
MuppET is a set of .pk3 files that change how the game looks and sounds. Because i realise some people don't want to change everything in their game, i split the mod into four parts: VISIT www.muppet.glt.pl FOR SCREENSHOTS 1. pak_muppet_skins This modifies nearly all of the sounds in ET.