How to add DLC to PSP games?

Smythius

I have a DLC for the game Metal Slug and have it working perfect on my PSP Go... I would like to get the DLC working on my RetroPie 4.5.1
I have installed the ppsspp emulator and can get Metal SLug to run... Now what files do I need to extract from the DLC and where do I place them in my Pie so that the game will recognize it but it doesn't show up as it's own game?

I was also wondering if someone could help me make is so retroarch doesn't create the .srm files in the same dir as the rom is in but have a seperate folder for those/save states so the number of files in my ROM dir never changes... either a save folder per/system, or just one save folder for all save states. thx in advance

RetroPie 4.5.1 base image from RetroPie site.
PSP emulator added with optional package menu in RetroPie

mitu

@Smythius said in How to add DLC to PSP games?:

I was also wondering if someone could help me make is so retroarch doesn't create the .srm files in the same dir as the rom is in but have a seperate folder for those/save states so the number of files in my ROM dir never changes... either a save folder per/system, or just one save folder for all save states. thx in advance

For this, you can edit the retroarch.cfg for each system/folder you have (\\retropie\configs\<system>\retroarch.fg) and add a line to configure a different save folder. For instance, let's say NES games should save the .srm files in /home/pi/RetroPie/saves/nes, then modify \\retropie\configs\nes\retroarch.cfg and add a line at the top of the file:

savefile_directory = /home/pi/RetroPie/saves/nes

# rest of the file

There is also a global retroarch.cfg (in \\retropie\configs\all) from where you can set a global folder, but in case of name conflicts between games in different systems, it would be better to configure the save folder for each system.

Smythius

@mitu Thx for this. would you happen to know if I define a location of a folder that does not exist, will it create said folder for me or return an error instead?