Yes - it can be done since a Quickbooks iif file is a fixed field length
text file with a header record and a footer record.
The data section itself is pretty easy since Access allows that to be done
routinely - but the header and footer are more of a problem (they require
code).
Additionally, its hard to find the info re: the proper structure for
Quickbooks ..you can get samples from Intuit but it takes a lot of
experimentation to actually use them properly ..
Not that it is going to make it any easier for you, but
Quickbooks is now going to qbXML (QuickBooksXML) format and
I understand that they will soon be dropping support for
IIF. Do a google on qbXML.