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Hi Tsuchi, I have already manually tried to delete the rtl_work directory and I always get the error message
"cannot remove folder rtl_work: the directory is not empty." I can't remember attempting to manually delete this directory before, but as it contains 0 files and 3 folders and each of these folders are empty I can't understand why I can't delete them, even if I turn read only off... the next time I look at properties it says read only again!? I don't know whether this is from Quartus or ModelSim or whether I have a bug somewhere...
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Maybe, there are hidden (and system) files.