imgtoiso.com
IMG to ISOConvert *.img format to *.iso format. IMG to ISO is a free small software utility, as its name suggests, it can convert the IMG image files into the ISO image files. The IMG is an disk image file format, it be used by some virtual drive software, Its file extension is generally .img or .ima. The ISO format seems to be more popular than IMG format now, So, if you want to convert your IMG files into ISO files, this little software just helps you. This program is a Freeware, use at your own risk.
http://www.imgtoiso.com/