That option doesn't seem to work anymore in the latest revisions, perhaps you have some older revision. That option was useful to identify the different texture formats being used in the game, like "CMPR" means Compressed Texture (S3TC).
:: System Specs ::
Operating System: Windows 7 Professional x64
Video Card: ATI Radeon HD 5770
CPU: AMD Phenom I X4 9550
RAM: 6GB DDR2
EXP Index: 999999.999999
Operating System: Windows 7 Professional x64
Video Card: ATI Radeon HD 5770
CPU: AMD Phenom I X4 9550
RAM: 6GB DDR2
EXP Index: 999999.999999