how can I burn .dmgs on Windows 7?
.dmg
I would like to do it free :)
Sadly I know only MagicISO and PowerISO what would do the job. Try MagicISO trial.
I have used Anyiso, transmac, macdrive and they ALL work well. Power iso works as well.
While it isn't explicitly listed as a supported filetype, you could try imgburn — it supports many different file types, and could potentially do a DMG.