I recently came across a dmg image file that I needed to use, but the problem is that Windows does not support dmg. I tried to mount it using MagicISO, PowerISO and Alcohol %120 but none can mount the file. I found a great feature in PowerISO that lets you convert dmg to iso. Here are the steps.
1. Open the dmg file with powerISO
2. Goto Tools..Convert..
3. Select your source file