only the extensions listed in the _readme.txt file of each system are supported

What about creating a subfolder in your roms/platform folder and mounting your bigger drive there?

@zetof

Quick answer! Not the one I was hoping for, but at least I can stop trying now! Weird as I have seen videos of it running in the Retroflag case from a year or more back, guessing it was unstable and removed? Thanks anyway, appreciate it.

@tdelios Just a single file per MAME version/folder, a lot less annoying than changing the core for every single game using the UI menus.
And no, there is no plan to split MAME into version.
Recalbox is currently supporting AdvanceMame, MAME2000, 2003, 2003+, 2010 and 2015 (maybe more in the future). It would be even more confusing than having a single folder.

As the sd card uses a Linux partition, you can probably just install a Windows driver that lets you read and write on such a partition. I haven't tried recalbox yet, but for ext3 or ext4 drives I have used succesfully ext2fsd
Read this : https://www.howtogeek.com/112888/3-ways-to-access-your-linux-partitions-from-windows/

Or just download and install https://sourceforge.net/projects/ext2fsd/files/
Reboot your PC and insert your sd card.
Cheers.
Don't forget to eject your sd card from Windows when you have finished to copy your files.

OK great man!

Thanks a lot

and by drivers you are referring to the BIOS files?

@gothrek

strange, but if it works now, it's good 😉

Please mark it as solved:
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Sorry, error with different 2 posts

@jor2404 o se puede con Windows. Tendras que utilizar linux pra poder copiar y pegar directamente de una a otra.

@voljega excellent! gave it a try and it worked great! thanks for your help

@subs You always know, what I need. Love ya, Bro!

Topic solved and closed 😉

Thank you very much!