KBID 31 Date Created: 9/15/2003 Date Modified: 9/15/2003
PCs running Outlook Express version 6 may receive this error message while attempting to open an Adobe Acrobat file attached to an email message. This feature in Outlook Express is designed to prevent potential malicious files from infecting the PC. Unfortunately, this restriction may also prevent you from opening files that are safe but share the same filename extension (i.e., PDF Adobe Acrobat files). To open these files, perform the following steps:
This should immediately allow you to open attachments with that extension.