I have now spend several hours to solve the real problem of self-extracting DOS archive with the offered virtual Win95 system. I fail to get the files into the virtual system. I think that I have done this correctly
In openSUSE the USB Stick can be found at: Bus 001 Device 007: ID 1307:0163 Transcend Information, Inc. 256MB/512MB/1GB Flash Drive
o USB-Controller enabled o USB-1.1-Controller (OHCI) o Filter for USB-Devices USBest Technology USB Mass Storage Device 
Manufacturer-ID: 1307 Product-ID: 0163 Revision-No: 0100 Manufacturer: USBest Technology Product: USB Mass Storage Device ...
After start of Virtual Machine Win95 1) There is no error message related to the USB connection. 2) The following drives are shown: 3 1/2 Floppy (A:) Win95 (C:) 3 1/2 Floppy (D:) 3 1/2 Floppy (E:) 3 1/2 Floppy (F:) (G:)
If I click the drives one after the other, a message box appears: 'Drive:' is not accessible The device is not ready Retry Cancel
So I cannot get access to the USB stick. Multiple reading of: https://www.virtualbox.org/manual/ch03.html#usb-support did not supply an answer...
I can't figure out, what could be the reason for the behaviour? No Win95 support for USB?