[Acharn]

I think it was last week I downloaded Sigil 9.0 and the FlightCrew plugin. I'm still running Windows 7 Ultimate 64-bit. The first attempt at installation didn't work, apparently there was a problem with installing python. The second time worked, and I successfully edited an epub which wouldn't validate for Google Play Books. Sigil was exactly what I needed. Today I downloaded some epubs from Project Gutenberg. They display fine in Calibre, but when I tried to open them in Sigil the program closed unexpectedly. I notice that Sigil is no longer associated with the .epub file extension, and when I try to associate it, Windows does not accept Sigil.exe as the default program. No error message, it just does not add Sigil to the window for programs to choose from. Not sure how to proceed, because if the problem is a malformed .epub file how do I find the fault?

Oh, I tried opening the file I was working on last week and it opened without difficulty. I didn't spend any time looking to see if there was any problem, just opened the file, noted that some .html and .opf and other files opened in the files window, but I've downloaded files from Gutenberg before and have sometimes had problems. Their new distributed proofreading has helped a *lot* with that.