show and hide. xp扩展名
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v HideFileExt /t reg_dword /d 00000001 /f
taskkill /f /im explorer.exe
start explorer.exe
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v HideFileExt /t reg_dword /d 00000000 /f
taskkill /f /im explorer.exe
start explorer.exe
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