I've come across a problem with loading mods in FRED2 open. I get the part where you rename the target with the whole "-mod " line, but the computer won't accept the change. I get a message saying the path specified in he target box doesn't exist. It's not just specifying mods, either. ANY change I make to the target box comes back as an error. Unless I revert back to the original target, it won't let me leave the properties box.

I'm wondering if there is something I missed when installed freespace open installer, or maybe a setting I have to change in windows.
Thanks for any help