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public enum ProductType
    {
        PRODUCT_UNDEFINED = 0x00000000,
        PRODUCT_ULTIMATE = 0x00000001,
        PRODUCT_HOME_BASIC = 0x00000002,
        PRODUCT_HOME_PREMIUM = 0x00000003,
        PRODUCT_ENTERPRISE = 0x00000004,
        PRODUCT_HOME_BASIC_N = 0x00000005,
        PRODUCT_BUSINESS = 0x00000006,
        PRODUCT_STANDARD_SERVER = 0x00000007,
        PRODUCT_DATACENTER_SERVER = 0x00000008,
        PRODUCT_SMALLBUSINESS_SERVER = 0x00000009,
        PRODUCT_ENTERPRISE_SERVER = 0x0000000A,
        PRODUCT_STARTER = 0x0000000B,
        PRODUCT_DATACENTER_SERVER_CORE = 0x0000000C,
        PRODUCT_STANDARD_SERVER_CORE = 0x0000000D,
        PRODUCT_ENTERPRISE_SERVER_CORE = 0x0000000E,
        PRODUCT_ENTERPRISE_SERVER_IA64 = 0x0000000F,
        PRODUCT_BUSINESS_N = 0x00000010,
        PRODUCT_WEB_SERVER = 0x00000011,
        PRODUCT_CLUSTER_SERVER = 0x00000012,
        PRODUCT_HOME_SERVER = 0x00000013,
        PRODUCT_STORAGE_EXPRESS_SERVER = 0x00000014,
        PRODUCT_STORAGE_STANDARD_SERVER = 0x00000015,
        PRODUCT_STORAGE_WORKGROUP_SERVER = 0x00000016,
        PRODUCT_STORAGE_ENTERPRISE_SERVER = 0x00000017,
        PRODUCT_SERVER_FOR_SMALLBUSINESS = 0x00000018,
        PRODUCT_SMALLBUSINESS_SERVER_PREMIUM = 0x00000019
    }

[DllImport("kernel32.dll", SetLastError = false)]
        static extern bool GetProductInfo(
             int dwOSMajorVersion,
             int dwOSMinorVersion,
             int dwSpMajorVersion,
             int dwSpMinorVersion,
             out ProductType pdwReturnedProductType);