Olk2k3 Periods gone from attachment name

I have come across a problem with Outlook 2003 that I am not sure is a bug or it was intentionally done by Microsoft.

When I recieve attachments of any type where the name of that attachment contains periods, for example:

report04.04.05.doc

or

piccie01.12.03.jpg

If I choose to open that attachement, the periods are removed from the title in the program that it opens up in. For example in word the periods are missing (you can see this on the blue bar across the top where the title is displayed) and appear like report04 04 05.doc.

Is this an intentional thing because if I choose to save rather then open the periods are presevered. If I open they are removed.

Anyone seen this before?

I have tried this on various machines in our offices so its not system or office version specific as far as I can tell.