To use this ROM with MAME you also need to download the following parent ROM
Chihiro Bios (chihiro)
Download CH
Download CHD for Gundam Battle Operating Simulator (GDX-0013) [Size: 346M]
Read more at http://www.emuparadise.me/M.A.M.E._-...lmqCyzm8ku3.99
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The file size of 211 bytes is correct that should show as 4.00 KB (4,096 bytes) Size on disc though
The error is just in the info given that should say 211 bytes instead of 4 KB
P.S. Mame roms should never be extracted, always keep them in zip format
To use that you also need the Parent rom Chihiro Bios (chihiro.zip) [It's a bios image]
You will also need the CHD file for Gundam Battle Operating Simulator (GDX-0013) (gdx-0013.chd) that is stored in it's own folder called gundamos, inside the roms folder
chd's must not be compressed, chd's are compressed images of HDD/CD/GDR/DVD and other none rom chip images so are not called roms