C# Signature:

[DllImport("shlwapi.dll", SetLastError=true, EntryPoint="#437")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool IsOS(OSType dwOS);

VB.NET Signature:

<DllImport("shlwapi.dll", SetLastError:=True, EntryPoint:="#437")> _
Private Shared Function IsOS(UInt32 dwOS) As _
<MarshalAs(UnmanagedType.Bool)> _
Boolean
End Function

VB Signature:

Declare Function IsOS Lib "shlwapi.dll" (TODO dwOS) As TODO

User-Defined Types:

/// <summary>
/// Options for IsOS() function
/// </summary>
public enum OSType : uint
{
     /// <summary>
     /// The program is running on one of the following versions of Windows:
     ///    * Windows 95
     ///    * Windows 98
     ///    * Windows Me
     /// Equivalent to PlatformID.Win32Windows. Note that none of those systems
     /// are supported at this time. IsOS(Windows) returns false on all supported
     /// systems.
     /// </summary>
     Windows = 0,

     /// <summary>
     /// Always returns true
     /// </summary>
     NT = 1,

     /// <summary>
     /// Always returns false
     /// </summary>
     Win95OrGreater = 2,

     /// <summary>
     /// Always returns false
     /// </summary>
     NT4OrGreater = 3,

     /// <summary>
     /// Always returns false
     /// </summary>
     Win98OrGreater = 5,

     /// <summary>
     /// Always returns false
     /// </summary>
     Win98Gold = 6,

     /// <summary>
     /// The program is running on Windows 2000 or one of its successors.
     /// </summary>
     Win2000OrGreater = 7,

     /// <summary>
     /// Do not use; use Professional.
     /// </summary>
     Win2000Pro = 8,

     /// <summary>
     /// Do not use; use Server.
     /// </summary>
     Win2000Server = 9,

     /// <summary>
     /// Do not use; use AdvancedServer.
     /// </summary>
     Win2000AdvancedServer = 10,

     /// <summary>
     /// Do not use; use DataCenter.
     /// </summary>
     Win2000DataCenter = 11,

     /// <summary>
     /// The program is running on Windows 2000 Terminal Server in either Remote
     /// Administration mode or Application Server mode, or Windows Server 2003 (or
     /// one of its successors) in Terminal Server mode or Remote Desktop for
     /// Administration mode. Consider using a more specific value such as
     /// TerminalServer, TerminalRemoteAdmin, or PersonalTerminalServer.
     /// </summary>
     Win2000Terminal = 12,

     /// <summary>
     /// The program is running on Windows Embedded, any version. Equivalent to
     /// SuiteMask.EmbeddedNT.
     /// </summary>
     Embedded = 13,

     /// <summary>
     /// The program is running as a Terminal Server client. Equivalent to
     /// GetSystemMetrics(SM_REMOTESESSION).
     /// </summary>
     TerminalClient = 14,

     /// <summary>
     /// The program is running on Windows 2000 Terminal Server in the Remote
     /// Administration mode or Windows Server 2003 (or one of its successors) in
     /// the Remote Desktop for Administration mode (these are the default
     /// installation modes). This is equivalent to SuiteMask.Terminal &&
     /// SuiteMask.SingleUserTerminalServer.
     /// </summary>
     TerminalRemoteAdmin = 15,

     /// <summary>
     /// Always returns false.
     /// </summary>
     Win95Gold = 16,

     /// <summary>
     /// Always returns false.
     /// </summary>
     MEOrGreater = 17,

     /// <summary>
     /// Always returns false.
     /// </summary>
     XPOrGreater = 18,

     /// <summary>
     /// Always returns false.
     /// </summary>
     Home = 19,

     /// <summary>
     /// The program is running on Windows NT Workstation or Windows 2000 (or one of
     /// its successors) Professional. Equivalent to PlatformID.Win32NT &&
     /// ProductType.NTWorkstation.
     /// </summary>
     Professional = 20,

     /// <summary>
     /// The program is running on Windows Datacenter Server or Windows Server
     /// Datacenter Edition, any version. Equivalent to (ProductType.NTServer ||
     /// ProductType.NTDomainController) && SuiteMask.DataCenter.
     /// </summary>
     DataCenter = 21,

     /// <summary>
     /// The program is running on Windows Advanced Server or Windows Server
     /// Enterprise Edition, any version. Equivalent to (ProductType.NTServer ||
     /// ProductType.NTDomainController) && SuiteMask.Enterprise &&
     /// !SuiteMask.DataCenter.
     /// </summary>
     AdvancedServer = 22,

     /// <summary>
     /// The program is running on Windows Server (Standard) or Windows Server
     /// Standard Edition, any version. This value will not return true for
     /// SuiteMask.DataCenter, SuiteMask.Enterprise, SuiteMask.SmallBusiness, or
     /// SuiteMask.SmallBusinessRestricted.
     /// </summary>
     Server = 23,

     /// <summary>
     /// The program is running on Windows 2000 Terminal Server in Application
     /// Server mode, or on Windows Server 2003 (or one of its successors) in
     /// Terminal Server mode. This is equivalent to SuiteMask.Terminal &&
     /// SuiteMask.SingleUserTerminalServer.
     /// </summary>
     TerminalServer = 24,

     /// <summary>
     /// The program is running on Windows XP (or one of its successors), Home
     /// Edition or Professional. This is equivalent to
     /// SuiteMask.SingleUserTerminalServer && !SuiteMask.Terminal.
     /// </summary>
     PersonalTerminalServer = 25,

     /// <summary>
     /// Fast user switching is enabled.
     /// </summary>
     FastUserSwitching = 26,

     /// <summary>
     /// Always returns false.
     /// </summary>
     WelcomeLogonUI = 27,

     /// <summary>
     /// The computer is joined to a domain.
     /// </summary>
     DomainMember = 28,

     /// <summary>
     /// The program is running on any Windows Server product. Equivalent to
     /// ProductType.NTServer || ProductType.NTDomainController.
     /// </summary>
     AnyServer = 29,

     /// <summary>
     /// The program is a 32-bit program running on 64-bit Windows.
     /// </summary>
     WOW6432 = 30,

     /// <summary>
     /// Always returns false.
     /// </summary>
     WebServer = 31,

     /// <summary>
     /// The program is running on Microsoft Small Business Server with restrictive
     /// client license in force. Equivalent to SuiteMask.SmallBusinessRestricted.
     /// </summary>
     SmallBusinessServer = 32,

     /// <summary>
     /// The program is running on Windows XP Tablet PC Edition, or one of its
     /// successors.
     /// </summary>
     TabletPC = 33,

     /// <summary>
     /// The user should be presented with administrator UI. It is possible to have
     /// server administrative UI on a non-server machine. This value informs the
     /// application that an administrator's profile has roamed to a non-server, and
     /// UI should be appropriate to an administrator. Otherwise, the user is shown
     /// a mix of administrator and nonadministrator settings.
     /// </summary>
     ServerAdminUI = 34,

     /// <summary>
     /// The program is running on Windows XP Media Center Edition, or one of its
     /// successors. Equivalent to GetSystemMetrics(SM_MEDIACENTER).
     /// </summary>
     MediaCenter = 35,

     /// <summary>
     /// The program is running on Windows Appliance Server.
     /// </summary>
     Appliance = 36,
}

Alternative Managed API:

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Notes:

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Sample Code:

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