Right click on the file gives no 'download' option, neither can I find one in the browser. For FireFox we added a video download extension & that won't download the files - it goes through the motions & gives up.
Nothing in Chrome or Edge to do it.
@pgs . Has this worked in the past?
I looked at Post Office using Chrome on Win7. Attachments show as links. Left click downloads the attachment to Downloads directory and displays an icon at the bottom of Chrome window (that's if the web page can't display the file).
In Windows Live Mail client, I can right click an attachment and get Save As option.