Alright, I get ya.
So when the stars align and everything is working as intended, it should just appear in your sidebar as a network device, so you just click into that and you have access. But that rarely is the case, so let’s try connecting manually.
On your Batocera machine, press Start and go to Network Settings. Note your IP address. Now, back on your Windows computer, open up File Explorer and then type
\\<IP address here>\ into the address bar at the top. For example:
\\192.168.0.144. Then hit Enter and you should be taken to the network share.
In the case it doesn’t work, you’ll be shown an error message. Copy + paste it here and we’ll work from there.