Ethan Rabinowitz Hi Ethan, no, I was told not to do so and I didn´t.  Yesterday I made another observation: Even when Spaceclaim is opened already, double-clicking a file leads to the same result shown in the pics above. If I drag and drop the file onto the already open program, it works however. It´s not a big nuisance, just strange. Could it be, that I have to direct to another executable file in the "open with" dialogue of the explorer?