I'm not exactly sure what you mean. Normally xvid & divx files are saved using an extension like avi or mov, etc. depending upon platform & application. On Mac OSX Divx files are saved with an extension of .divx This is not one of the default shared extensions in LW. So it would need to be added under LW's preferences, Sharing, shared extensions.

If you're searching for videos that may have been encoded with those codecs, you could try including it in the search.
eg: video title - divx

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