Using "Import >Office Content" button in WYSIWYG, in IE7 it doesn't strip out XML tags

This issue has been reproduced on IE7.
1/ Create a wiki page in the Sandbox.
2/ Click on Edit link. It will bring you in the WYSIWYG edition mode
3/ Copy text in your clipboard from any Office Word Document.
4/ Paste the text in the window opened from step 3/
5/ Click on "Import" button.
6/ You should see XML tags added.