DMG Converter
DevConverter converts your archives online. Amongst many others, we support ZIP, RAR, TAR.GZ and 7Z. No need to download any software like WinRAR or 7ZIP.
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DMG
DMG files are disk images, which are used on Apple Mac OS X. They can be burned on CDs or DVDs or they can be mounted as a volume. Mostly file system HFS+ is used in DMG archives.