qemu smb access problem host: linux, guest: win10

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Hello!

I have problems, accessing a shared folder from Windows 10 guest on my OpenSuse host machine.

I can access the shared folder in my virtual machine with \\192.168.0.4\qemu.
However, If I open it with explorer I get a Could not access \\192.168.0.4\qemu error.
In the Windows command line I"m getting a file not found message.
net use \\192.168.0.4\qemu works without any problems.
The permission of the shared folder (/opt/virtMachines/share-win10) and all files in it is rwxrwxrwx.

The smbd version is 4.7.11-git.153.b36ceaf2235lp150.3.14.1-SUSE-oS15.0-x86_64.
The qemu version is 2.11.2.

I start the qemu with the following options:
qemu-kvm -smp 8,sockets=2,cores=4,threads=1 -cpu host,kvm=on -m size=1024 -k de \
  -balloon none \
  -monitor unix:qemu-monitor-socket,server,nowait -daemonize \
  -cdrom /opt/virtMachines/dvds/empty.iso \
  -hda /opt/virtMachines/images/win10.qcow2 \
  -drive file=/opt/virtMachines/images/vs-and-tools.qcow2 \
  -drive file=/opt/virtMachines/images/src-and-build.qcow2 \
  -display sdl \
  -vga vmware \
  -netdev "user,id=mynet0,restrict=y,net=192.168.0/24,dhcpstart=192.168.0.130,hostfwd=tcp::2228-:22,hostfwd=tcp::2238-:3389,smb=/opt/virtMachines/share-win10" \
  -device rtl8139,netdev=mynet0 \
  -boot order=dc,menu=on -no-quit


How can I access my shared folder?

Thank you!

Have a nice day

   Thomas Strasser