Can't read transferred sample files ???? HELP!

[racket]

just bought myself a cardreader but i can't use any of the files once i get them on the computer. none of the .spd files can be read. i downloaded and installed SealedMedia or whatever it's called but still nothing works.
can anyone help me out?

[ColeRockLee]

Here’s how to convert a sample to an audio file and write it to a
memory card.
1.
Make sure that [PATTERN SELECT] is not lighted.
If it’s lit, press [PATTERN SELECT] to switch it off.
2.
Hold down [CANCEL] and press [RESAMPLE].
“FiL” (File I/E) appears in the display, and [REC] and
[RESAMPLE] begin blinking.
3.
Press [RESAMPLE]. “EXP” (File Export) appears in the
display, [REC] lights, and [RESAMPLE] goes out.
4.
Select the export-source sample bank.
Press one of the BANK [A]–[F/J] buttons. The button you
pressed lights, and that bank (A–F) is selected. If you press a
BANK [C/G]–[F/J] button once again, the button starts
blinking, and a G–J bank is selected.
Pads to which a sample is assigned begin blinking.
5.
Select the export-source pad.
The pad you pressed lights, and the remaining pads stop
blinking. Also, [REC] begins blinking.
You can select multiple pads if they are within the same sample
bank. Press any pad that was blinking at step
4
to select it.
6.
Press [REC] so it’s lit.
During the export operation, the dot in the display will blink.
When the export is complete, the blinking will cease.
If there is an identically-named audio file in the root directory
of the memory card, it will be overwritten.

Via page 39 of the 404 manual. The spd file is the 404's proprietary format. Convert em to wav/aif first.