[quote user="Jan Kr��ger"]
So I created a folder with CCS and moved the source files in it, recompiled it and .. oh: The linker doesn't find my functions anymore, including the main function.[/quote]
Try use import project instead, point to your old project directory then proceed importing checking copy code to workspace.
A better way is to also create a new independent workspace too.
Copy and paste never update file link and other path are stored on project file.
Is a bad practice use absolute path but this is done this way and windows with it obsolete c:\ multiroot path is the worst can be in place.