Majax, Hell has already informed you of the simple answer to your question and so perhaps you may wish to understand further why winmx should not be hacked up to do as you require, the first and most important reason is the program is heavily compressed to make the installer built into it smaller, thats the first hurdle and then the second is to locate the relevant section (or sections) in assembly code which will mean you have to be very patient as the program is just over two megabytes and assembly language is unfortunately pure goobledy-gook to most winmx users, and even if this was done successfully winmx has an in-built checksum to prevent tampering.
The second idea you touch upon of modifying the actual list held in "ignore.dat" is not possible as the size of the list and the control of it is performed by the winmx program itself, modifying this file would serve no purpose, this file is encrypted as are all the other dat files to prevent abuse and no published method exists to decrypt and encrypt it again anyway.
I wont insult the skilled people in the community by stating it cant be done but I can say with certainty it is not easy and that its an unwritten rule here that we will not hack up the winmx program out of respect for its author and his rights.
I,m sorry but in this case we cannot and will not provide any help or information to assist you.