Importing Fl Studio files to MPC 2000

Hi I am having trouble getting my Fl Studio files to interact with my MPC 2000. I have been using Fl Studio to time stretch samples. I tried converting the Fl Studio files back to AU format sound files to be put back into the MPC zip file. I receive an error message when I try to open the converted files in my MPC. It tells me that I don't have enough memory on my MPC to open the files. Can anyone help me with this?
Thanks

Thanks for the help.

you can always resample them in through your record in.

they gotta be windows PCM, WAV files.