Internet Explorer の User Agent 変更方法
To add the Version key with a spoofing user agent string value:
%windir%\System32\cmd.exe /k %windir%\System32\reg.exe ADD "HKLM\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent" /v Version /d "Opera/9.2.1" /f
To delete the Version key and revert back to original user agent string value:
%windir%\System32\cmd.exe /k %windir%\System32\reg.exe DELETE "HKLM\Software\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent" /v Version /f