: Beyond burning, you can edit existing DMG files by adding or removing folders, or even create a brand-new DMG from local files. Pricing and Licensing
It sounds like you're looking for a to add to a tool (likely a ROM hacking or save editing utility) named "UUByte DMG Editor" — possibly for Game Boy (DMG) files — with an emphasis on "full extra quality" (meaning high precision, additional metadata, or enhanced editing capabilities). uubyte dmg editor full extra quality
Easily Burn, Open and Extract DMG File on Windows & Mac - UUByte : Beyond burning, you can edit existing DMG