Cannot get unified diff from Show Log dialog

Let me start by saying that this is definitely a windows problem, not TSVNs.
All worked fine until I installed OrCAD on this workstation. Then the "Show
differences as unified diff" started invoking OrCAD (file association I'm
sure). So I uninstalled OrCAD (didn't really need it on this machine anyway)
and now TSVN throws an error "Could not start diff viewer" (see the attached
screenshot). Anyway, what I want to know is, what file extension/association
is TSVN trying to invoke, so I can repair the damage the OrCAD installer
inflicted upon my workstation.

Thanks,

Glenn Heard
Software Engineer
Altronic Inc.
ICQ: 123194600
Y!: glennheard

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"I do not fear computers. I fear lack of them."
-Isaac Asimov

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