Ah i have a feeling what you need is a program called quickpar
QuickPar for Windows
what you have there seems to be files that need repairing in order to be able to extract
I wont go into detail about it as i don't want unknown support any illegal activities
though if that's not the case and im understanding you correctly renaming the rar's wont help at all
you need all part rar 01 to whatever the originator set (part 10.rar) to be able to extract and will most likely Contain another several rar's that will contain the file you want
in simple term the originator took one whole file and divided it into a fraction.... you need all the fractions to make a whole..... with all the pieces you can the proceed to extract the intended data