Drag drop html table in powerpoint 2007

Question

Hello... i've been dealing with this problem for quite a while: Our company develops addins for word/excel/ppt (both for 2003 and 2007 versions)

One of the options our addins offer is to drag a table from the addin into the application.

This is implemented in 3 different ways:

1. Excel --> we create a tab delimeted string and drag-dropping it as DataFormats.text
2. Word --> we create an RTF table, and drag-dropping it as DataFormats.rtf
3. PPT --> we create an HTML table, and drag-dropping it as DataFormats.html

everything is working great in both the 2003 & 2007, except for the powerpoint 2007, which doesn't seem to support any kind of html dropping (unlike powerpoint 2003, which is working great)

We've tried everything but we're beginning to despair... anyone knows how to resolve this?