Include Files In Vista

Just upgraded to Vista Ultimate, and running IIS7 for offline web development. Suddenly getting the message

Active Server Pages error 'ASP 0131'

Disallowed Parent Path

/daters/cards/previewCard.asp, line 98

The Include file '../viral_update.inc' cannot contain '..' to indicate the parent directory.

This worked fine in Win XP Pro/IIS6. What goes on? Do I have to use the full path or must the include file be located in the same directory.