Software restriction policy: problem opening documents

[Theo Carr-Brion]

I have set up a software restriction policy on my Vista Ultimate PC.
This works fine. However, as a side affect I can no longer open PDF
(adobe reader) or Word (2007) documents from a CD or USB flash drive by
double clicking them. They will open if dropped onto an already running
program. They open fine from the main drive.

If I double click on a word document on a flash drive (F I get
"Windows cannot find F:\test.doc. Make sure you typed the name correctly
and then try again. I can open a DPF by dropping in onto an already
running instance of adobe reader. If I try the same with test.doc on a
running copy of Word it opens in a strange mode where I am unable to
edit it properly. F:\Test.txt opens fine by double clicking. I am a
limited user and user account control is on.

I have restricted it so ordinary users can only run programs from
"program files" and the "windows" directory.

Do Word and Adobe Reader use some special mechanism to open the files
that is being interfered with? Text files appear to open OK.

Can anyone help?

Theo Carr-Brion