I would say probably nothing. If you are using Premier Pro make sure the latest Quicktime Download is installed and it comes up in the files to open , not “All files’, the Quicktime mov. extension should be showing , otherwise it will not work.
If you were running Quicktime Pro on a PC in Australia which is PAL territory, the Apple Techs will tell you they cannot help ? Great service !
Thsi is in XP, WIN 7 I thought had all the bugs removed, maybe not ?