GameSave Manager

Save location without administrator:
C:\Users\%username%\AppData\Local\VirtualStore\Program Files (x86)\KONAMI\Yu-Gi-Oh! Power of Chaos Common\system.dat

C:\Users\%username%\AppData\Local\VirtualStore\Program Files (x86)\KONAMI\Yu-Gi-Oh! Power of Chaos Common\*.ydr

C:\Users\%username%\AppData\Local\VirtualStore\Program Files (x86)\KONAMI\Yu-Gi-Oh! Power of Chaos Common\*.ydc

Save location with administrator:
C:\Program Files (x86)\KONAMI\Yu-Gi-Oh! Power of Chaos Common\system.dat

C:\Program Files (x86)\KONAMI\Yu-Gi-Oh! Power of Chaos Common\*.ydr

C:\Program Files (x86)\KONAMI\Yu-Gi-Oh! Power of Chaos Common\*.ydc

Note:
*.ydr files contain recorded demos.
*.ydc files contain saved decks.
The system.dat file is related to the game progress.

---
registry entry:
HKEY_LOCAL_MACHINE\SOFTWARE\KONAMI\Yu-Gi-Oh! Power Of Chaos\system

For this game to be supported, we need a way of dynamically detecting it's installation directory.
This is typically achieved via their "uninstaller" entry within the registry (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\GameKeyHere).

"DisplayName"="Yu-Gi-Oh! Power of Chaos YUGI THE DESTINY"
DisplayVersion"="1.00.0000"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\{3571656A-575D-4CED-809D-5547587121FF}]

"DisplayName"="Yu-Gi-Oh! Power of Chaos YUGI THE DESTINY 2.0"
"DisplayVersion"="2.00.0000"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\{7F23ED88-D755-4A3A-AB04-E909C7C0330A}]

Here are the 2 other Yu-Gi-Oh! games from the same series.

"DisplayName"="Yu-Gi-Oh! Power of Chaos KAIBA THE REVENGE"
"DisplayVersion"="1.00.0000"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\{485C9280-B899-4D46-86F3-B3E459636EE5}]

---

"DisplayName"="Yu-Gi-Oh! Power of Chaos JOEY THE PASSION"
"DisplayVersion"="1.00.0000"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\{336DD6B4-B100-4048-B2B7-FBA7059FD959}]

...and the registry value to target? I assume InstallLocation, but I'll await confirmation.