The MS Outlook blocks you by default certain attachments that arrive with the emails, because it considers that they can be harmful to your computer. What happens is that many times it is too severe and restrictive, and it does not allow you to download files that are totally clean and harmless. So that this does not happen again this tool called Outlook Antiblock has been created.
In Outlook Antiblock it is the user who decides which files are blocked and which are not. You just have to select and mark in a list the file extensions that are allowed, and so it will never block them again.
Outlook Antiblock works with MS Outlook 2000 and 2003 (it does not work for Outlook Express).
You can free download Outlook Antiblock 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.