Kdenlive saves files with extension .xml

Kdenlive saves project files as .xml instead of .kdenlive. Therefore, it's impossible to open a project by using the Open dialog. Projects however, can still be opened with the Open Recent menu.
I'm using OpenSuse 11.4 with KDE 4.6 and Kdenlive version 0.7.8

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As a workaround, you can just rename them from .xml to .kdenlive.
Did you check the box «automatically append .kdenlive» in the Save As dialog?