@shentar,
You don't need to use the 'Open With' plugin to choose a different program (from standard calibre Viewer) to open .LIT books.
Instead go to Prefs - Behavior. In the right-hand list, labelled use 'internal viewer for' and uncheck LIT. Also, in Windows, make sure that MSReader is set as the default program for opening .LIT files. Similarly you can use the same method for your DJVU, PDF books, or any other formats which have a more suitable reader app than the calibre Viewer.
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