The only way to see if it will work is to try and do it (import it to a test
web, rather than ruining any work you've done, just to see if FP will open
the files). Make copies of the original files in case this does not work,
so you will still have the original GoLive files intact.
I presume it will - plain html code in which case I don't see why Frontpage
shouldn't be able to work with it. It might have its own code that it adds
for certain things (similar to Frontpages webbots for example) that might
not be compatible with FP