Hi Gizmo,
I most frequently attach the Info1 and the example resume at the same time. According to file order the Info1 file, which is the one that first won't attach, loads first. So far those have been the only two files I've had trouble attaching. When I rename them they attach OK. Everything else about the file remained the same.
But there is something else fishy going on that seems to be related. I once was able to insert inline images within the body of HTML formatted email messages. Emoticons, image thumbnails and the like. At about the time my Info1 file first wouldn't attach ("Can't create file...") I had trouble including inline images in my messages. If Outlook had not yet saved a draft of the message I was able to insert files into the message body. If Outlook had already saved a draft of the message I would get the little red X in a box representing the image. If I inserted an inline image before Outlook saved the draft, but then Outlook saved the draft before I send the message, the image would be replaced by the little red x in a box representing the image.
After I directed Temporary Internet Files to a new temp folder the inline images began sticking in the message body normally, but after a couple of weeks the trouble began again.
This all seems so convoluted I hope I'm explaining it clearly enough. I appreciate your interest in this. I've found search results on the Web that seem to dance around what 'm experiencing, but noting that hits is right on the head.
This may have something to do with the system applying protection to the Temporary Internet Files folder. I can't find anything in the MSKB that deals with this set of weirdness.
Thanks, - Dave