[HKEY_CURRENT_USER\Software\EasyBoot Systems\UltraISO\5.0]
"UserName"="李明"
"Registration"="66294559707f6d42115b3d29050d1b43"
"Language"="2052"
"SaveBackup"="0"
"SuperRestore"="0"
"Install"="1"

[HKEY_CLASSES_ROOT\.pdf]
@="FoxitReader.Document"

[HKEY_CLASSES_ROOT\FoxitReader.Document]
@="PDF Document"
"BrowseInPlace"="1"
"EditFlags"=dword:00010000

[HKEY_CLASSES_ROOT\FoxitReader.Document\DefaultIcon]
@="C:\\Program Files\\Foxitreader\\FoxitReader.exe,1"

[HKEY_CLASSES_ROOT\FoxitReader.Document\shell\open\command]
@="\"C:\\Program Files\\Foxitreader\\FoxitReader.exe\" \"%1\""

[HKEY_CURRENT_USER\Software\Foxit Software\Foxit Reader\LANGUAGE]
@="40807d"

就是用REG ADD类的写法。请看附件

reg add "HKCU\Software\EasyBoot Systems\UltraISO\5.0" /f /v "UserName" /t REG_SZ /d "李明"
reg add "HKCU\Software\EasyBoot Systems\UltraISO\5.0" /f /v "Registration" /t REG_SZ /d "66294559707f6d42115b3d29050d1b43"
reg add "HKCU\Software\EasyBoot Systems\UltraISO\5.0" /f /v "Language" /t REG_SZ /d "2052"
reg add "HKCU\Software\EasyBoot Systems\UltraISO\5.0" /f /v "SaveBackup" /t REG_SZ /d "0"
reg add "HKCU\Software\EasyBoot Systems\UltraISO\5.0" /f /v "SuperRestore" /t REG_SZ /d "0"
reg add "HKCU\Software\EasyBoot Systems\UltraISO\5.0" /f /v "Install" /t REG_SZ /d "1"
reg add "HKCR\.pdf" /f /ve /t REG_SZ /d "FoxitReader.Document"
reg add "HKCR\FoxitReader.Document" /f /ve /t REG_SZ /d "PDF Document"
reg add "HKCR\FoxitReader.Document" /f /v "BrowseInPlace" /t REG_SZ /d "1"
reg add "HKCR\FoxitReader.Document" /f /v "EditFlags" /t REG_DWORD /d 65536
reg add "HKCR\FoxitReader.Document\DefaultIcon" /f /ve /t REG_SZ /d "C:\Program Files\Foxitreader\FoxitReader.exe,1"
reg add "HKCR\FoxitReader.Document\shell\open\command" /f /ve /t REG_SZ /d "\"C:\Program Files\Foxitreader\FoxitReader.exe\" \"%%1\""
reg add "HKCU\Software\Foxit Software\Foxit Reader\LANGUAGE" /f /ve /t REG_SZ /d "40807d"
搞定了