When running jscc.exe from different directory that JS/CC's, it does not find its driver :
error: unable to open file 'driver_jscript.js_'
Workaround: run jscc.exe from its directory and use full paths to source and target files.
For an example build script that work around the bug see http://code.google.com/p/registry-files-tools/source/browse/trunk/Build.cmd
The problem could be resolved by an environment variable directing to the template file location.
This is only JS/CC for Windows Script Host specific.