OAD is a file extension associated with office productivity software package Suite Notaro. OAD files are not used much outside Italy and thus OAD is considered a niche file format. The format was developed by OA SISTEMI.

Suite Notaro software package is mostly used in business environments. Suite Notaro is distributed as a paid software, but a demo version can be obtained after contacting with the developer. There are no tools available on the market that allow conversion of OAD files into other, more popular, text document formats.