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[bossi]

Awesome! Thanks for the work Don. In case anyone is reading this in the future, I had to make two changes to my settings in addition to the "ThumbsExtraExtensions" entry to get it working for zip/rar. Make sure the extensions you want thumbnailed are listed in "Thumbs64Ext" in your ini file. This might be because cbxshell is 64 bit and Xy is 32. Then go to Settings -> Previewed Formats -> Preview as Thumbnail, and make sure those same file extensions are defined there as well.

wanted to give a smull bump . indeed this is the hidden solution.
worked for epub + azw3

somehow , cbr + cbz worked with CDisplay out of the box .