While both the 1984 and 2011 editions of the NIV are available as e-Sword modules the 1978 version which was the first complete NIV bible published (The NIV NT was published on it's own in 1973) is not available.
However I recently discovered a module repository for the MyBible App which includes a MyBible module of the 1978 NIV. Here is the really interesting thing about this, both MyBible and e-Sword use SqLite databases for module creation which means converting the MyBible 1978 NIV module for e-Sword will be easy to do.
It is probably not possible to upload a 1978 NIV module to Biblesupport for downloading but I wonder if there are some who would want to study the 1978 NIV
If you want to see the Mybible module repository here is the link: