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QuickTime .qtx/.qtr/.qt/.mov files defined

Q: What are the differences between QuickTime files with the .qt, .qtx, .qtr and .mov extensions?

A: A .mov file is, of course, a movie file. A .qt file is (for historical reasons) an alternate extension for movie files (.qt's and .mov's are identical).

The .qtx and .qtr files are pieces of QuickTime extensions (e.g., codecs and file importers). A .qtx file contains the data fork (it's a Windows DLL, actually), while a .qtr file contains the resource fork (for Macintosh-style resources). Note that you may embed a .qtr resource file into a .qtx file so you don't have to actually ship two files for your product. To accomplish this, use the QuickTime Rezwack tool to combine a .qtx file and a .qtr file into a stand-alone .qtx file.

[Sep 05 2000]


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