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I'm adding all my maps to run from one three letter folder, and because my maps have support for both DTII, and BFX, I'm trying to get the code IsFileExist working, so that people without these mods won't see the extra era's on the selection screen. I've got it working for individual maps, but can't get it working for a map pack, as only the new era's show up for one map, and not the others. If I don't use the code if ScriptCB_IsFileExist all the era's work fine. Below is my addme script:
Any help would be appreciated.

You're only adding the new eras and game modes to map TDS. Is that what you're trying to do or did you want them added to the other two maps as well?

I think what you really want is to be using AddNewGameModes() inside of your IsFileExists() checks. Notice how the sp_n variable changes each time you added a new map: sp_n = table.getn(sp_missionselect_listbox_contents) That line says get the size of the list and the sp_n+1 code ends up meaning put this new map info at a new entry at the end of the list.

Inside your IsFileExists() checks, you don't change sp_n, so it only adds the eras once and only to the last map you added (TDS).

Also, change your AddNewGameModes() to the new version I've posted about a couple times. It matters that more people use it. It keeps map list from becoming unstable. We're not going to want to deal with the user support nightmare of maps replacing parts of each other's entires. I'm too lazy/cold/hungry/busy to look up where that code is right now.

Thank you for getting back so quickly, I do appreciate it.

I did want to add the new eras and game modes for the other two maps as well, so I think you've given me enough info to go on. It will just take me time to figure it out. I'll do a search for your other posts on the subject, and get working on it. I'll let you know how I get on, and update this post.