Version:            (using KDE KDE 3.3.0)
Installed from:    Compiled From Sources
Compiler:          gcc 3.4.1 
OS:                Solaris

While importing existing project and choosing a filename (in the initial filename window) that already exists (actually a semi-intuitive thing to do when *importing existing* project) KDevelop will overwrite the original file without warning.

Say for instance I have mycode.cpp sitting in a directory and I choose "Import Existing Project." In the initial filename window, I choose "mycode.cpp." The editor window opens up with the filename and generic template - boom the original file is now gone.