some thoughts on this.
I am not sure what you want to state. Searching of renamed/moved files is implemented in MultiPar already. For my English skill, it is difficult to understand sentence of non-fixed grammar. You would better to write some story of example cases, or just write "I want that." or "This is not enough." directly.
Where's the SOURCE, dude?
About source code, you should read my documents like Help or ReadMe in the archive. While you don't read my documents, you say you want to read source code, that is odd attitude. If someone is just a user, using without reading manual is ok. My MultiPar is almost same usage as QuickPar and easy to use. But, as a developper, reading documents is required to understand the mechanism.
Data integrity software is very important to be open source.
MultiPar is one of some parchive clients. There are other clients like QuickPar, phpar2, par2-tbb and more for many systems. Anyone can use his favorite parchive client. The important matter is the ability of repair in future. While WinZip and SecureZip are not open source, many people uses ZIP archive, because the file format is open public.