The Artifex editor for SFC3 is included in the serverkit. (Same for OP)
I think all the Artifex's register to the same key (at least EAW and OP do...), so check that the registry points to the right directory for the version you want to run at the time. They only seem to self register once, the first time an Artifex.exe is run, if it finds the registry keys it doesn't seem to update them, so double check to be sure the registry point to the definitions file that corresponds to the Artifex version you want to run.
edit: Actually I just checked and the Artifex included in SFC3 is the same as OP (v0.0.0.3), just the definitions file differs, all you need is the Defnitions file for SFC3 maps... no wonder they use the same keys, its the same exe! Too bad it wouldn't compare its run location to its registry entries, or prompt for the location of the definitions file on startup...
I just double checked, the Artifex in the SFC3 serverkit and the Artifex in the OP serverkit have the same checksum. -> Only the Definitions.txt file differs.