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There is a problem in the new version 0.13.4
I can't open any saved pages with the ext. ".MHT", even the old saved ones by previous versions or even the pages saved by internet explorer 6. it show a blank page named "untitled". The only pages I can open are those with ".HTM" extension.
I'm using Firefox 3.5.1, windows XP SP2.
Thanks..

Questa recensione riguarda una versione precedente (0.13.4) del componente aggiuntivo. 

It has been reported that, if the file extension is written in uppercase, Firefox fails to open the file. Renaming the file extension to lowercase can be a viable workaround until the problem is solved.

I'll mention this in the "known issues" section of the release notes for the next version.