To summarise the problem, we have deployed part of our solution in IWP using HTTPS and have a problem downloading any file from a container field using Internet Explorer versions 7 & 8 (the other common browsers are fine).
When clicking into a container, the file download appears to start and then you get an error stating that "data.file" cannot be found.
I've been searching around the Internet looking for a solution to this problem - I've found a couple of threads, but found nothing useful. (you may find my posts at the bottom, before I decided to try and amalgamate the thread