ATT00001.htm attachments since 10.6.4

I have read a few posts about this being an issue but have not found a solution.
The most important part to me is that I have never had this issue until the recent 10.6.4 update.
Does anyone know WHY my file attachments are now sending out as html files and HOW I can fix this? Some have proposed that this problem is with Outlook. I can verify that my issue is not. I can go in to my SENT messages folder and see the same ATT00001.htm attachments. Although, as far as I can tell, this issue is only with my exchange account. I also have me.com and gmail.com accounts that I don't appear to have an issue with.
TIA!

This is indeed almost certainly an Exchange issue; unless you've changed your settings, your Sent mail is on the Exchange server. The Mail-Exchange interaction immediately splits any text after an included attachment into a separate attachment, so it will appear that way in the Sent mail. Most likely this didn't crop up before (if indeed it didn't and you just didn't spot it) is that previously you were attaching things at the end of your messages and didn't have any text after the attachment.
The workaround for this is to make sure your attachments are at the end of your email, below any text. There's a setting under Edit -> Attachments where you can enforce this. Other than that I know of no fix, and Apple doesn't acknowledge this as their bug to fix.
Regards.

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