Why does my quicktime player verson 10.2 somtimes read avi files and other times it wont recognize them?

  Why does my quicktime player version 10.2 sometimes read AVI video and other times it will not recognize that same file. I have a video card that sometimes it will read then the next time it recognizes the card but will not open the video. Message says "quicktime does not recognize this file.
Whats up with that ??? Any help will be most appreciated!

AVI is a container just like MKV, WMV, MOV, and MPEG. It is possible to use many different compression formats aka. codecs in an AVI container.
Think of the container - AVI as being an envelope, and the compressed video in it as a letter. The letter may be in a language you cannot read even though you know how to open the envelope.
Historically QuickTime did have some built-in ability to use AVI files and some formats in those files, this used to be further improved by installing the free Perian (for Mac only). However with Mavericks Apple have removed the ability for QuickTime X aka. QuickTime Player 10 to use AVI files, it now really only accepts MPEG4 or H.264.
It is still possible to install QuickTime 7.6.6 in Mavericks and if you use it and Perian rather than QuickTime X you can still use various AVI files.
Note: Mavericks also now no longer shows previews or thumbnails for AVI files for the same reason.

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