Issue with Diff-Script for PowerPoint 2007

Dear TortoiseSVN Developers

First I want to let you know, I am a big TSVN fan, and normally
everything works great. Congratulations for your great work!

However, there is an issue with Office 2007 in Diff-Scripts\diff-ppt.js,
and it's not yet in the issue tracker as far as I could see.

What I did:

Right-click on a ppt file -> [show log] -> right click on an earlier
version -> [compare with working copy]

(I used a ppt, not pptx but I think it'll be the same behaviour)

What I expected:

Powerpoint opening and showing differences in "Review Mode".

What happened:

Powerpoint opened and showed the following error message:

Script: C:\Program Files\TortoiseSVN\Diff-Scripts\diff-ppt.js

Line: 49

Char: 1

Error: Presentation.Merge: Invalid request. This method or property is
no longer supported by this version of PowerPoint.

Code: 80048240

Source: Microsoft Office PowerPoint 2007

Thanks

Roman