Welcome to "Extras" they are extra cleo mods that add more features to the Boeing 737-800 
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Extras folder 
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"Contrails" folder

"B738_contrail.cs" -> Adds contrails at high altitude
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"Wing effects" folder

"B738_wings.cs" -> Adds wing condensation effects on wings when you gain some speed

"Effects_required" folder -> You need to install this in your modloader foler or wing effects won't work!
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"Searchlights" folder
"B738_lights2a.cs" and "B738_lights2b.cs" -> Press "H" key to enable searchlight effects, but it's glitched
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Real name folder 
"at400.fxt" -> It replaces the name "AT400" with "Boeing 737-800" 

Move folders to modloader or copy all of them in the same folder of Boeing 737-800 in Modloader!