Thanks for the reactions and possible solutions.
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The USB is reacting good to Windows 11 commands, but the FT-847 is not recognised by several softwares like FL-Digi, HamRadio Deluxe or WSJT-X. I tested it with standard RS-232 cable and O-modem serial cable, but no luck so far. I have a USB model with an FTDI chip on the way to be delivered later today. Also had an older one that also works with Windows 10 and 11, but sadly no luck with it. Mind you Windows has no problems with it and I used a serial connection software check-up that sees no problems with it.
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My radio is made in 1999, so I guess it is OK.
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73' Ron