I discovered a solution. If I change the included filename's extension to anything other than 'inc' and 'asp', it works.

I have recently upgraded my OS from XP PRO sp3 to Vista Ultimate x86. When I was working with XP I could access and work with my .ASP files by default using IIS (I think it was ver. 6,0, in contrast to 7.0 that comes with Vista). But now I get some kind of error, as follows: http://i25.tinypic.com...