It seems that if you put a file download control on an xpage, and that application is in a sub folder,
ie. data\applications\application.nsf

then you will receive an error trying to open the files. The developer evidently forgot to get the path of that database when creating the link.

Work Around:
It you put the same database in the data directory it works great.

Don’t know why this has not been fixed seems like it would be simple, with a feature release.