I'd send my pennies on doing this with runnas, and then 'encrypt' the scriptfile into a kx, if you still need to do this with a script.
check the InGroup in the kix ref-guide.
Second, even if you alter the security settings for that map, you still wanna kick off the adding of the dll, right?
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as long as it works - why fix it?
If it doesn't work - kix-it!
