In light of the following
thread, I think kasmot is asking the wrong question.
Kasmot, you do not need DX7 or D50 programs/patchs to be imported to the X50. The X50 already has FM electric pianos samples that will probably do fine for the purposes described in that thread.
Here are the multisamples:
21 E.P.-FM 1
22 E.P.-FM 1 LP
23 E.P.-FM 2
24 E.P.-FM 3
25 E.P.-FM 3 LP
You need to learn how to use the multisamples to create your own programs. This is done by picking these multisamples for OSC1 & OSC2 High and Low in program mode. You can modify any existing electric piano program to use these multisamples instead of whatever it's currently using.
You probably could spend several weeks just learning how to create and modify programs to use the 400+ multisamples that the X50 has built-in. Multisamples are not the same as presets or programs. Multisamples are the basic building blocks that are used to create programs. They are the raw recordings in the ROM memory that are manipulated by the program to produce the sound it makes. There are many levels to understand about programming a synth as powerful as the X50. Multisamples -> Programming -> Programs -> Combis/Multis. Because multisamples are part of a program, you can't actually hear the raw recordings until you create a new (init) patch and then change the OSC1/OSC2 parameters to pick the different ones in Program mode.