Command -register-for-pdf (register SumatraPDF as the default PDF) not working

Using Windows 10 64 I’can’t register SumatraPDF 3.2 as the default PDF from command line with

The command functioned well in Win XP 7 & 8
Windows 10 will not allow you to use that method (afaik, but I have not tried to force it recently)
Windows 10 expects Edge to be the Default PDF reader and persuading it to not do so has been a to and fro battle which varies per release

I install on Windows 10 without that option
Then kick windows in the shins by selecting a pdf and telling associations
its my fervent wish it allows SumattraPDf to open similar such files

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Windows 10 doesn’t allow programs to do it themselves (unlike earlier versions).

You have to do it as described at

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The following also works for me equally well:

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