DisableHyperlinkWarning in Vista

Running Vista Home Basic on laptop, with Office 2007.

In Powerpoint,one slide has a Hyperlink to a Flash (swf) file, that opens
with the Standalone Flash Player.

Annoying warning pops up each time.

I found numerous references to Registry tweak adding key
HKCU\Software\Microsoft\Office\12.0\Common - add key Security - add DWord
DisableHyperlinkWarning (1). It doesn't work. I presume it's an XP
rather than a Vista Registry fix?

How to do it in Vista???? The bloody stupid Nanny warning is most
off-putting in the middle of a high-level PP presentation:

Opening C:\path\xxxxx.swf. Some files can contain viruses or otherwise be
harmful to your computer. It is important to be certain that this file
comes from a trustworthy source. Would you like to open this file?

There is no option to tell Nanny Vista that the file is OK and to stop
nagging me about it. Murder is becoming a viable option.

Paddy