I have exactly the same problem after updating my system from XP to
Windows7.
After a few tries, I found that draging and droping a thconfig file on
the Xtherion link (which is "C:\Program Files
(x86)\Therion\bin\wish84.exe" "C:\Program Files
(x86)\Therion\xtherion.tcl") was working
For the last few years I have been adding a non-'therion'-standard extension
to thconfig files, eg thconfig.thc so that I can open them in XTherion
directly from the Windows File Explorer.
The first time this is attempted an association needs to be made with 'Wish
Application', but thereafter it
