I used Quicktime extensively for my research before upgrading to Mavericks, and now that these older codecs have been removed, none of my experimental videos taken over the past 5 years will play in Quicktime. This is extremely disappointing.
I'd like to gather as much user support as possible to request that Apple restore support for these older codecs.
PLEASE RESPOND ON THIS THREAD BY ADDING YOUR REQUEST FOR APPLE TO RESTORE SUPPORT FOR OLDER CODECS.
FYI, my video files were .avi format, recorded by a Nikon D300s and a Zeiss EVO 55 scanning electron microscope.