1. download this:
Yu-Gi-Oh! PoC - Joey The Passion ALL CARDS UNLOCKER
2. extract the files using WinRAR
3. now you have 4 files. One of them is "system.dat"
4. look in you YUGIOH-folder (where you have installed the game) there must be also a file "system.dat". (Perhaps there is a "Common"-Folder)
5. copy the new "system.dat" over the old one
6. open the file "all cards.reg" with the editor. In the file is this:
[HKEY_LOCAL_MACHINE\SOFTWARE\KONAMI]
[HKEY_LOCAL_MACHINE\SOFTWARE\KONAMI\Yu-Gi-Oh! Power Of Chaos]
[HKEY_LOCAL_MACHINE\SOFTWARE\KONAMI\Yu-Gi-Oh! Power Of Chaos\system]
"InstallDirJ"="C:\\Programs\\Yu-Gi-Oh! Power of Chaos JOEY THE PASSION\\"
"Lang"=dword:00000002
"flcrc"=hex:82,47,89,43,01,a6,ed,02,30,20,92,0 8,72
"CommonDir"="C:\\Programs\\Yu-Gi-Oh! Power of Chaos JOEY THE PASSION\\Common"
7. You have to edit the red marked paths to the paths you used.
8. save the file and execute it.
9. Play the game with all cards.