Find Userexit/badi

Hi Experts

My seniors have made some user exit or badi to the transaction VF02 to download a text file while save the transaction in change mode.

Now i want to do some changes in it, but am not able to find the user exit/badi, how can i find.

I have tried to find using exit_handler, and cutomer_exit, but there is no such names, but its working , advise me how can we find.

Regards

Rajaram