It should be in the configuration folder in your User's configuration in the library. It is a hidden folder on mac. The library folder is hidden.
To access the library folder in 10.7 follow these steps:
1) In the Finder, choose Go > Go To Folder.
2) In the Go To Folder dialog, type ~/Library
3) Click Go.
It should be there... it is called macfilecache.dat and has a number appended to the file name.