Another easy way to check the file using the demo version of the nsf file recovery utility Lotus Notes Recovery Toolbox. There is a possibility that the file be able to recover it....

So you didn't back up the ID-file of every user or the server?? Oh dear me...
NSF databases are in a special format, and the easiest way to read them is with Lotus Notes, so you won't see anything...

I think you need to clean all cookies and history in browser,all downloads. then restart the compute rand try again to download.

this comes to you in the mail? have you tried to open it?