Thanks to you all

I've tried the numon/numoff given in the first NTDOC's answer, and it fits perfectly.
I've just shell numoff before sendkeys and it works great.
This gives an instant answer to the problem.

I'll check AutoIt but this stuff would be more time consumer.

Thanks to all of you one more time.
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Comments always welcome. French native so I apologize for my (mis)use of English!