This application doesn't support command line arguments, its true.
What you can do is following (using the fact, that this executable is LabVIEW application with llb behind):
1. Copy NI VIsion Template Editor.exe to NI VIsion Template Editor.llb
2. Cut header up to signature RSRC in any suitable hex editor (you can use Far Manager, for example). Your file should begin with RSRC...
3. Create New VI and place GPM Training Interface.vi from NI VIsion Template Editor.llb onto your Block Diagram
Now you can connect input image as well as template image, so File->Open will be not necessary any more.
Theoretically you can create small wrapper application, which will receive command line arguments, then open the images and pass images into this SubVI.
Andrey.
PS. Hopefully the NI license agreement is not broken with this action (because small modification of the original executable is required)