The BLK file format is associated with Amiga, a type of personal computers sold under the Commodore brand during the 1980s and 1990s. BLK files store bitmap images and are part of the Amiga IFF (Interchange File Format) pack. They became obsolete together with the demise of Amiga computers and are currently compatible with a limited number of image viewers.
The quick and simple way to handle your files is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch conversions. As you will soon realize, reaConverter will help you avoid spending countless hours trying to figure out how to convert multiple BLK files as once.
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