Every time I am trying to open Quicktime files with my Quicktime it wants to convert the files. Why?

Every time I am trying to open Quicktime files with my Quicktime it wants to convert the files. Why?

QuickTime version 10.3 will "convert" older legacy codecs into a more modern version. You can save this newer version and delete the older one.
This can only mean that support for those codecs will be removed completely some time in the future.

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