REG QUERY "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.扩展名\OpenWithList" /v "MRUList" >nul 2>nul
REG QUERY "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.扩展名\OpenWithProgids" /s >nul 2>nul
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REG DELETE "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.扩展名" /f
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@echo off
for /f "delims=" %%a in ('reg query HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FileExts') do (
  reg query %%a /s |findstr "REG" >nul &&echo.%%a有键值>>result.txt||echo.%%a没键值>>result.txt
)
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$key = Get-ChildItem -Recurse 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts';
For ($i=$key.Length-1; $i -ge 0; $i--) {
    if($key[$i].ValueCount -eq 0 -and $key[$i].SubkeyCount -eq 0){ Remove-Item $key[$i].PSPath -Recurse }
}
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