A quick test under Windows gives me this:
two-synfigstudio-windowsxp.png [ 203.2 KiB | Viewed 347 times ]
I opened two files by double clicking on the file browser and it opened two Synfig Studio.
It (apparently) didn't crash but there shouldn't be two Synfig Studio instances running. It will break the settings files for sure. Not good.
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