I had occasion recently to wish to burn a BIN file lacking a CUE file. In the end I extracted from the BIN and burnt the individual files/folders. But I did later look for utilities and came across two little files which convert BINs to ISOs.
They are both called Bin2Iso
1. Lundy - Bin2Iso
Converts a BIN file (when the CUE file is missing!) to an ISO file which then can be burned to CD.
available from http://www.weethet.nl/english/download.php
2. Riazi Bin2Iso
This is a free tool for converting one CD image format (Bin) to another format (ISO). The conversion routine is very simple. Just read the Bin image and according to it's structure, write the data in another format.
available from http://www.codeproject.com/tools/Bin2Iso.asp.
Unfortunately the download requires a (free) registration.
I believe that both are 'genuine' portable apps.