C# Signature:

[DllImport("rapi.dll")]
public static extern int CeGetVersionEx(ref CEOSVERSIONINFO ceosver);

User-Defined Types:

[StructLayout(LayoutKind.Sequential)]
public struct CEOSVERSIONINFO
{
    public int dwOSVersionInfoSize;
    public int dwMajorVersion;
    public int dwMinorVersion;
    public int dwBuildNumber;
    public int dwPlatformId;
    [MarshalAs(UnmanagedType.ByValTStr,SizeConst= 128)]
    public string szCSDVersion;
}

Notes:

function info on msdn at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceactsy/html/cerefCeGetVersionExRAPI.asp

Tips & Tricks:

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Sample Code:

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Alternative Managed API: