I use this...
What do you use?
[ autoit ]
; HttpSetUserAgent User Agent. Local Const $aOSArch[2] = ['32', '64'] ConsoleWrite('AutoIt/' & @AutoItVersion & ' (Windows NT ' & RegRead('HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\', 'CurrentVersion') & '; Win' & $aOSArch[@AutoItX64] & '; x' & $aOSArch[@AutoItX64] & ') Version/' & @AutoItVersion & @CRLF)