Not sure how it works in Steam... But with a regular PC install, you would have had to go to Add Ons Central and downloaded and installed the 3 different skins... Then you would locate the OOTP 20 skins folder which would house the 3 skins sub folders ootp 20, ootp 20 classic and ootp 20 dark... Open up one of those folders and then open up the style_sets folder and then you have to find the folder where that particular graphic resides...
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