Strange files in %LOCALAPPDATA%\Mixxx\controllers

It seems to me that in Mixxx 2.2.4 on Windows 10 v1909 unnecessary user files are created in %LOCALAPPDATA%\Mixxx\controllers that may indicate some issues.

If I start and stop Mixxx the users controllers folder remains empty.
But after plugging in my Pioneer DDJ-200 controller, starting and stopping Mixxx I find the following files in it:

Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 10/4/2020 10:41 AM 204 HIDI2C_Device_9999--2.hid.xml
-a---- 10/4/2020 10:41 AM 204 HIDI2C_Device_9999--3.hid.xml
-a---- 10/4/2020 10:41 AM 204 HIDI2C_Device_9999--4.hid.xml
-a---- 10/4/2020 10:41 AM 204 HIDI2C_Device_9999--5.hid.xml
-a---- 10/4/2020 10:41 AM 204 HIDI2C_Device_9999--6.hid.xml
-a---- 10/4/2020 10:41 AM 204 HIDI2C_Device_9999--7.hid.xml
-a---- 10/4/2020 10:41 AM 204 HIDI2C_Device_9999.hid.xml
-a---- 10/4/2020 10:41 AM 201 HID_Miniport_Device_〷㐲--2.hid.xml
-a---- 10/4/2020 10:41 AM 201 HID_Miniport_Device_〷㐲.hid.xml
-a---- 10/4/2020 10:41 AM 201 HID_Miniport_Device_￿搘䉈灰--2.hid.xml
-a---- 10/4/2020 10:41 AM 201 HID_Miniport_Device_￿搘䉈灰.hid.xml
-a---- 10/4/2020 10:41 AM 206 Sharkoon_Mobile_DAC_28.1_3.hid.xml

After restarting Mixxx again and loading my controller mapping I find in addition:

-a---- 10/4/2020 12:03 PM 38694 DDJ-200.midi.xml
-a---- 10/4/2020 12:03 PM 205 DDJ-200_0001_2.hid.xml
-a---- 10/3/2020 10:00 PM 1946 Pioneer-DDJ-200-scripts.js

Questions:
1. Since it is only one controller, why are there so many files?
2. Until I have loaded the controller mapping, should there be any files at all?
3. Why does my Sharkoon_Mobile_DAC soundcard appear, if it previously did not appear? I had not unplugged it in the meantime?
4. Does it make sense to have Asian UTF8 characters in the filename with respect to a portable Mixxx version that is supposed to run from a FAT32 drive?
5. Why is there the DDJ-200_0001_2.hid.xml

The situation looks messy to me and I think it could be improved.