Using Calibre Portable on Win XP
Trying to associate epub, mobi etc files with the viewer but all that happens is the viewer opens bit gives the message "input file must have an extension". But the input file has got an extension, the only way I can get it to work is if I rename the file.
Any clues ? Such a good reader needs using.
https://www2.mobileread.com/i/smiliesadd1/smack.gif