It appears that Vista will not allow the FRC license to be changed from .txt to .lic. Does anyone know anything about this problem?
I don't use Vista, but it sounds like the windows "feature" of hiding file extensions. Here is a web page that explains how to turn that feature off. http://www.tech-recipes.com/rx/1468/vista_show_extensions_for_known_file_types/ Once you've done that, see if you can remove the .txt extension.
Is it that you couldn't get the extension changed, or that after changing the extension you still don't have the FRC option in License Manager? This post has some helpful information you might want to check out: http://decibel.ni.com/content/thread/1663?tstart=0