I want Linux bootable iso file but nero creates only Nrg file while creating image from cd so first i created a nrg file then extract it by using Universal extractor then again convert it to Iso but, the problem is that virtual machine is not taking that iso file as a bootable file and showing error "No bootable media was found".

so please tell me how to create bootable iso for linux or other OS directly without creating nrg first.