Resolved corrupted DATA

when I have modded my test drive unlimited 2 I inject it into the two places where it has the game progression save files and I then put it back into the xbox and it just says corrupted every time I do it I have started several new games and tried doing it again all over but still nothing but it saying that it is corrupted I just want to know if im doing anything wrong also im new to this so could do with a step by step walk threw if possible what I do is

1.copy data to memory stick
2.open in 360revolution
3.go to the save file I want there is the save file and a folder and I just extract the save file not the files in the folder but one of which seems to be the same as the one I extracted
4.open the file with the modding tool
5.mod and save the file to my documents
6.go to my devices again and go back to the save file and inject the modded file into it and also to the one in the folder which is the same as the one on its own
7.put the memory stick back in the xbox and load the game
8.open the save game and says the data is corrupt

please someone help what am I doing wrong????

thanks!