Don't worry Aziz, I'll make a YouTube video that explains it all to you
In the meantime, here's some written instructions:
1. you will need to download Texmod
2. you will need to extract texmod once extracted open the text mod folder
3. Double click the texmod application
4. Click the folder at the top under "Target Application" and navigate to C:\Program Files\Eidos\Batman Arkham Asylum Demo\Binaries and select SHIPPINGPC-BMGAME.EXE
5. Click the "Logging Mode" mode tab and untick "Show texture In upper left corner"
(you can change your output to what ever but i find PNG are very nice formats)
6 Click "Run" at the bottom now the batman demo should load, once loaded navigate to the character trophies and select batman
7. Navigate threw the textures using the "+" and "-" keys on the number pad for next and previous respectively ( the select texture will turn lime green ) *Note there are over 450 textures loaded on this screen and not all can be seen you may have to hold down the "+" key for a while until things start turning green.
8.Once you have found the texture you want to edit click the "ENTER" key and close the game. Open you desired image editing software i personally use photshop cs4 and drag and drop your extracted texture into the software *Note Extracted textures can be found in the "Out" folder inside the texmod folder.
9. Once you have editing you texture click save and select the format you extracted the image in KEEPING the same name as the original file.
10 once completed go back to texmod and click the "Package Build" tab. use
TexMod.log as your definition file and click build. (depending on the amount of editing textures this can take some time). once finished you will be asked to name a .TPF file call this whatever you wish but something you will remember. for instance i use
Beyond BAA StalkerUKCG v0.2.tpf. Beyond being the costume, BAA the game and my user name and then the current version im on. my versions never reach a v1.0 till iv released them
11. after you have done this navigate to the Package Mode tab and click the folder icon above the red X and browse to your specific .tpf file you ahve just created once this has been loaded click run and test out your skin.
Batman Begins/ The Dark Knight hybrid: