I created my books' library in Ubuntu 12.10. I switched to Win 8 recently however.
I thus copied my whole library folder to my new machine. I then switched to this library in my uptodate Calibre.
Many books don't open ("No file available") and when I right-click and "Go to folder", I see two folders: one with the metadata and the cover. And one with the ebook. However, I cannot open that file, because I just get an "File path too long"-error.
I guess the file length limitation within Windows is the problem. But how to solve it? I may open the library in a Ubuntu VM, but how to get the filenames shorter permanently?
Find attached two example screenshots: