Cannot download log files from APM 2.6, MP 1.3.58 - strange error

**Issue details**
Hi, I am not sure if it is a missionplanner problem. But, since I updated to 1.3.58 I cannot download log files from my APM 2.6 anymore. I get the message on the picture. What does that mean? I am not "Michael" an there is no path C:\users\michael\... on my PC. I get the same message when I try to download via Terminal. I can download log files from my Pixracer and Pixhawk 2.4 but not from APM 2.6.
**Version**
On my APM 2.6 there is Arducopter version 3.1.5 because I had some problems with 3.2.1.
**Platform**
Copter
**Airframe type**
Quad
**Hardware type**
APM 2.6


Start by reproducing the log-download failure from an APM 2.6 running ArduCopter 3.1.5, using both the normal download flow and Terminal as described. Compare it with downloads from Pixracer or Pixhawk 2.4; done means the APM 2.6 log downloads without the incorrect Michael path error.

Written by the indexing model from the issue text.