Re: Capture & Open file use 2 instances of HS8. How to force only one instance?
Strange, I just tested this here, works correctly, just one instance. Do you have maybe HyperSnap 7 and HyperSnap 8 installed on your system, and you use one of them, while the other is set up to open the files from Explorer? Or are the two windows exactly the same version? Maybe you have HyperSnap - same version, but installed in two places, two directories, and one of them is set up for file opening? I don't know what else could cause this.
Hint: I usually don't set my copy to open files with Explorer double-click. Instead, if I want to open graphics files in HyperSnap from Explorer, I just drag them from there to HyperSnap window.