Ever met files with the extension UIF of DAA, these are likely CD/DVD images saved to a file, the idea is that they (as opposed to ISO) can be compressed, however not everyone has software installed to deal with these files.
Well good news come in small links, here is a link to a blog with links to utilitys to convert these files 🙂
DAA;
http://w-shadow.com/blog/2007/12/27/free-daa-to-iso-converter-gui/
UIF;
http://w-shadow.com/blog/2007/12/30/uif-to-iso-converter/
or the software source itself; http://aluigi.altervista.org/mytoolz.htm