Bewenched - 1:15 am on Oct 21, 2012 (gmt 0)
It's not php, it's actually asp but we map everything to .htm files since there were old static pages with that extension. 99% of the files really don't exist... they're all done through IIS and ISAPI rewrite.
Side note: Just checked FB and it appears it's only on FB pages that the link is like that. If you have one of the activity boxes on your site it's not linked that way and they resolve fine. Wonder if this is a FB "error".