Look for a file named _vti_inf.html example:
www.example.com/_vti_inf.html
This file shows (in View Source) which version of extensions are installed.
Version 4.xxx = FP2000
Version 5.xxx = FP2002
--
Ron Symonds - Microsoft MVP (FrontPage)
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"Dick" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> How can you tell from the source code if FP extensions are installed?
> I know it's possible, because some of you MVP's have checked sites for
> me and were able to tell.
>
> Dick