Welcome, your newbness. And trust me, it's not on the front intro screen.
Before I begin, please know: Before you can play any custom stuff, you must own at least one
DLC.
Custom campaigns here:

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Custom standalone scenarios* here:

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Mods here:

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*By this, I mean
standalone scenarios. If you look in our Scenario Design forum, you will see threads for Custom Campaigns, Custom Single-Player Scenarios, and Custom Multi-Player Scenarios. Mods are sprinkled about in unstickied threads. Campaigns have their own interior Scenarios folder, so don't get confused; if you are downloading a campaign, the entire folder goes into C:\Users\[your name]\Documents\My Games\Order of Battle - WW2\Campaigns. If you are downloading a single standalone scenario, it goes into C:\Users\[your name]\Documents\My Games\Order of Battle - WW2\Scenarios.
Note: Right now, I am editing the scenarios of a certain campaign. That's why my Scenarios folder looks rather orderly, with numbered files. Ordinarily, it will not look like that.
Another note: Many people use the term "mods" to mean all custom designed stuff. Here, custom scenarios and custom campaigns use the vanilla version of the game. Mods, on the other hand, employ files that have been altered by custom designers to look and function differently. This is sanctioned by OOB's owners as long as you don't try to hijack the game and/or sell your version for a profit. See here; I have two mods installed in addition to vanilla OOB:

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I will stop talking now because I am verging on TMI.
