Как проверить, что система является Windows 7 или Windows Server 2008 R2 в Установщике Wix?

Vista и Server 2008 pre-SP2 имеют одинаковый основной номер версии. Вам также нужно найти эквивалент Wix для 'VER_NT_SERVER' (InstallShield). (сейчас на работе, здесь Wix не установлен)

См. https://www.msigeek.com/442/windows-os-version-numbers и https://www.lifewire.com/windows-version-numbers-2625171 для пример

<Condition Message='Windows 95'>Version9X = 400</Condition>
<Condition Message='Windows 95 OSR2.5'>Version9X = 400 AND WindowsBuild = 1111</Condition>
<Condition Message='Windows 98'>Version9X = 410</Condition>
<Condition Message='Windows 98 SE'>Version9X = 410 AND WindowsBuild = 2222</Condition>
<Condition Message='Windows ME'>Version9X = 490</Condition>
<Condition Message='Windows NT4'>VersionNT = 400</Condition>
<Condition Message='Windows NT4 SPn'>VersionNT = 400 AND ServicePackLevel = n</Condition>
<Condition Message='Windows 2000'>VersionNT = 500</Condition>
<Condition Message='Windows 2000 SPn'>VersionNT = 500 AND ServicePackLevel = n</Condition>
<Condition Message='Windows XP'>VersionNT = 501</Condition>
<Condition Message='Windows XP SPn'>VersionNT = 501 AND ServicePackLevel = n</Condition>
<Condition Message='Windows XP Home SPn'>VersionNT = 501 AND MsiNTSuitePersonal AND ServicePackLevel = n</Condition>
<Condition Message='Windows Server 2003'>VersionNT = 502</Condition>
<Condition Message='Windows Vista'>VersionNT = 600</Condition>
<Condition Message='Windows Vista SP1'>VersionNT = 600 AND ServicePackLevel = 1</Condition>
<Condition Message='Windows Server 2008'>VersionNT = 600 AND MsiNTProductType = 3</Condition>
<Condition Message='Windows 7'>VersionNT = 601</Condition>
<Condition Message='Windows 8'>VersionNT = 602</Condition>