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XCOM EU 2012 is built on version 3 of the Unreal Game Engine. (Note this is different than verifying', which is comparing certain files on your computer against the distributed files on the Steam servers.) Then the altered extract files must be re-compressed into a replacement executable, with a hash code that is used by the Steam game launcher to ensure a correct file structure. Despite appearances, when modding it is necessary to extract the UPK and SWF files from the 'cooked' executable and make changes to the extracted versions. These are in a mixture of text and hex code. \Steam\steamapps\common\XCom-Enemy-Unknown under the sub-folder \Binaries\Win32, the game executable: XComGame.exe. with file extensions of INI, INT, UPK, BIK, BIN, BMP, HTML, CSS, and CONFIG), the only ones of concern to Mods at this point in time are INI, INT, and UPK extensions and in the of. While XCOM:EU 2012 installs a number of 'configuration' files (i.e. 2.2.7 XCOM Extended Perk tree mod generator.
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2.2.6 Online XCOM Extended Perk tree mod generator.2.2.5 Online XCOM Perk tree mod generator.2.2.4 Online XCOM Base Planner for Long War beta 13+.
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