Ive made a solidworks add-in DLL. if i drag and drop my DLL into solidworks everything is fine. then if i want to make changes to the DLL. when i go back into solidworks i get an error. so i remove the DLL from the registry using regedit. then drag and drop the DLL back into solidworks. and everything is fine again. there must be a better way to test my DLL then having to remove it from the registry every time. does anyone have some insight on this. thanks. Sean Phillips