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Will try with dBase. Thank you.

Kaseta - is that magnetic cassette? The file could be an image of a cassette, like you can dd a disk to image file today.

yes. It should be casette inline. I must have printed it out, cut and glue to an empty casette. Those were the days!

To me KASETA.IMG looks exactly like an binary pixel image, maybe monochrome, where every bit represents a pixel.

The part where you see 1.1.1 is actually like this in hex:

31 02 31 02 31 02 31 02 31 02 31 02 31 02 31 02

I suspect it's some sort of color ASCII art format. Character/attribute pairs with probably some control information. That explains why the other files have readable text.