REG QUERY HKEY_CURRENT_USER\Software\Classes\.pl /S

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HKEY_CURRENT_USER\Software\Classes\.pl
    (Default)    REG_EXPAND_SZ    PerlScript

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REG QUERY HKEY_CURRENT_USER\Software\Classes\PerlScript /S

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HKEY_CURRENT_USER\Software\Classes\PerlScript\shell\run\command
    (Default)    REG_EXPAND_SZ    "c:\usr\local\apps\berrybrew\perls\system\perl\bin\perl.exe" "%1"  %*