While we wait for the roll-up pack here is a rough guide to making encrypted sets.
All that is needed is to replace the program ROMs. The program ROMs are stored in the 02 file.
Then you extract the program files, concatenate them and pad them to 4MiB.
[I have attached some blank files to make life easier]
Let us take Dimahoo as an example. Start with the MAME set.
Open a command line window:
unzip \tmp\dimahoo.zip
The program ROMs are the ones from 3 - 6, you can get this info the the MAME source code or looking at the extensions.
copy /b gmde.03+gmd.04+gmd.05+gmd.06 gmd.bin
dir gmd.bin
11.11.2017 18:21 2 097 152 gmd.bin
We see that gmd.bin is 2 MiB so we need to pad it:
copy /b gmd.bin+blank_2mib.02 gmd.02
ren dimahoo.key key
xcopy /y gmd.02 i:\games\dimahoo
xcopy /y key i:\games\dimahoo
Then enjoy this fantastic game from RAIZING
View attachment blank.zip