Version: (using KDE 4.4.1) OS: MS Windows Installed from: MS Windows opening saved sessions from Kate, it throw the error "The file protocol was died unexpectedly". Analyzing kate session file, the urls are malformed. It store "file://C:/ ..." instead of "file:///C:/ ...", and kate is unable to find saved files. Same problem with Kompare. I have configured TortoiseSVN to show diffs with it, passing urls as arguments, and kompare is unable to find files. Seems to be a problem of KUrl implementation. I'm using WindowsXP, with KDE 4.4.1 installed from kdewin-installer-gui (binary package).
Created attachment 42822 [details] invalid url example restoring saved sessions from kate, a lot of "Copy" windows appear (one for each stored file). The source url does not have a colon for the C: drive.
This has been fixed long ago.