Interesting... I've not experienced problems so far.
I wonder if originating platform or zipping app has anything to do with it. I have had problems with zips from a specific person which I am trying to figure out...
send me a small zipped db to firstname.lastname@example.org (which will forward to my private email that I check on my ipad and iphone) and I will let you know the results.
When I tried to download the file on my iPad, the file would not load into the Mail message from the server.
When I tried to open it on my desktop I got the following dialog:
I hope that helps... but I suspect that DEBUG could also be some component in Go.
What intrigues me is your file name. It has a '.fmpur' extension. This implies a runtime... which should not need FM Go. What the expected behaviour of a zipped runtime would be in iOS, I am not sure. You say to open in FM Go but I am not sure.
Can you send another file with the .fmp12 extension zipped.