Win 8.1 預設隱藏「系統體驗指數」（WinSAT），但功能仍保留於系統。提供進階與一般使用者兩種找回法。

方法一：命令列查看 XML 評分記錄（適合進階用戶）

1. Win+X →「命令提示字元 (系統管理員)」→ 輸入 winsat -help 查看指令用法。

2. 執行 winsat formal 執行完整評分。

3. 前往 C:\Windows\Performance\WinSAT\DataStore 查看 XML 記錄。預設七項評分：CPU、Disk、DWA、Graphics3D、GraphicsMedia、Mem、Formal（總覽）。

關鍵分數對照：

• MemoryScore → 記憶體
• CpuScore → 處理器
• GraphicsScore → 圖形效能
• Dx9SubScore → DX9 效能
• GamingScore → 遊戲圖形效能
• DiskScore → 主硬碟效能

方法二：匯入 PerfCenterCPL.dll 恢復 GUI 介面（適合一般用戶）

1. 下載 PerfCenterCPL.dll 擴展套件（含 32/64 位元），將 system32 與 sysWOW64 內檔案複製至 C:\Windows 目錄。

2. 將以下登錄碼存為 PerfCenter.reg 匯入：

Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\CLSID\{78F3955E-3B90-4184-BD14-5397C15F1EFC}]
@="Performance Information and Tools"
"System.Software.TasksFileUrl"="Internal"
"InfoTip"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,50,00,65,00,72,00,66,00,43,00,65,00,6e,00,74,00,65,00,72,00,43,00,50,00,4c,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,32,00,23,00,69,00,6d,00,6d,00,75,00,74,00,61,00,62,00,6c,00,65,00,31,00,00,00
"LocalizedString"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,50,00,65,00,72,00,66,00,43,00,65,00,6e,00,74,00,65,00,72,00,43,00,50,00,4c,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,31,00,23,00,69,00,6d,00,6d,00,75,00,74,00,61,00,62,00,6c,00,65,00,31,00,00,00
"System.ApplicationName"="Microsoft.PerformanceInformationAndTools"
"System.ControlPanel.Category"=dword:00000000
[HKEY_CLASSES_ROOT\CLSID\{78F3955E-3B90-4184-BD14-5397C15F1EFC}\DefaultIcon]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,50,00,65,00,72,00,66,00,43,00,65,00,6e,00,74,00,65,00,72,00,43,00,50,00,4c,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,31,00,00,00
[HKEY_CLASSES_ROOT\CLSID\{78F3955E-3B90-4184-BD14-5397C15F1EFC}\InProcServer32]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,68,00,64,00,6f,00,63,00,76,00,77,00,2e,00,64,00,6c,00,6c,00,00,00
"ThreadingModel"="Apartment"
[HKEY_CLASSES_ROOT\CLSID\{78F3955E-3B90-4184-BD14-5397C15F1EFC}\Instance]
"CLSID"="{328B0346-7EAF-4BBE-A479-7CB88A095F5B}"
[HKEY_CLASSES_ROOT\CLSID\{78F3955E-3B90-4184-BD14-5397C15F1EFC}\InstanceInitPropertyBag]
"ResourceID"=dword:00000064
"ResourceDLL"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,50,00,65,00,72,00,66,00,43,00,65,00,6e,00,74,00,65,00,72,00,43,00,50,00,4c,00,2e,00,64,00,6c,00,6c,00,00,00
[HKEY_CLASSES_ROOT\CLSID\{78F3955E-3B90-4184-BD14-5397C15F1EFC}\ShellFolder]
"Attributes"=dword:a0000000
"WantsParseDisplayName"=""

3. 建立 WinSAT.bat 批次檔註冊相關 DLL：

@echo off
regedit /s PerfCenter.reg
regsvr32 /s "%SystemRoot%\System32\PerfCenterCPL.dll"
regsvr32 /s "%SystemRoot%\System32\WinSATAPI.dll"
regsvr32 /s "%SystemRoot%\System32\diagperf.dll"
regsvr32 /s "%SystemRoot%\System32\perftrack.dll"
regsvr32 /s "%SystemRoot%\SysWow64\PerfCenterCPL.dll"
regsvr32 /s "%SystemRoot%\SysWow64\WinSATAPI.dll"

4. 執行 WinSAT.bat → 控制台「小圖示」檢視 → 開啟「效能資訊與工具」即可看到直觀評分介面。

終於找回隱藏的系統體驗指數！