For your information, I programmed some kind of workaround in version 3.0: temporary files are now stored in subdirectories of C:\Users\user\AppData\Roaming\eTeks\Sweet Home 3D\work, and the files that still can't be automatically deleted at program end, will be deleted during a further program launch when they are more than one week old.
Now that the bugs #6962459 and #6962458 are publicly visible, please, please vote for them.
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Emmanuel Puybaret, Sweet Home 3D creator
