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If you drag and drop an attachment from one email to a new. Or copy and paste the attachment from one email to a new. With these KBs installed the attached file in the new email will end up with double file extension. Or these KB will add an extra file extension on the attached file in the new email (filenamn.pdf will be named filename.pdf.pdf in the new email.)

This will most likely block the email from being received if the receiver are using any SPAM/AV system that, with god reason, block attachments with double or more fileextension.

Pretty annoying.