4BT stands for "4bit" and represents an image format associated with GoDot, an image editing program used on Commodore 64 computers. Commodore was one of the first brands of personal computers available for home users and its extremely popular model 64 was released in the early 1980s. To this moment, Commodore 64 represents the best sold computer model of all time. The 4BT format is currently a rare format, so opening or editing it might be difficult with regular programs.
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