Just began using Gnutell/LimeWire 2.6.3 with Mac G4. Wanted to share my own collection which I am saving in the QuickTime v6 .mp4 (MPEG4/ACC/ISMA compliant) format and was disappointed to note that the "library" filter does not recognize this extension. Am hoping this will be rectified in the near future. (Am currently saving files with .mpg extension and noting mp4 format type as part of the title name.)