Hello,
thanks for your fast responses. After having read the info about mwac.sys (the link posted by MAM), I searched for this driver, but could not find it on the OS drive. After that, I searched for mwac.cat again, and it was not found on the locations I found them previously. This is a bit strange. I am no Windows Pro, but after exile360 mentioned the WFP, I come to suspect that it might have something to do with the 'new' MB WFC (formerly known as 'Binisoft WFC')...
I will have an eye on this, but otherwise ignore it.
Thanks and Best regards,
Peter.