Checking for Windows Server 2003

Question

I created theses functions for installing some files on Windows Server 2003, I want to know if this is the correct way.

function IsServer: Boolean;
var
  ver: TWindowsVersion;
begin
  GetWindowsVersionEx(ver);
  Result := UsingWinNT and (ver.Major = 5) and (ver.Minor >= 2) and Not IsWin64;
end;

function IsServer64: Boolean;
var
  ver: TWindowsVersion;
begin
  GetWindowsVersionEx(ver);
  Result := UsingWinNT and (ver.Major = 5) and (ver.Minor >= 2) and IsWin64;
end;

Answer 1

You didn't show us what UsingWinNT does – Though you definitely do not need to check for "NT" – Inno Setup-made installer won't even start on non-NT system.

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IsServer64 will return true even on Windows XP Professional x64 Edition, as it also has 5.2 version.

To distinguish these, test ver.ProductType = VER_NT_SERVER.
See How to programmatically tell the difference between XP 64 bit and Server 2003 64 Bit

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function IsWindowsServer2003_32Bit: Boolean;
var
  Ver: TWindowsVersion;
begin
  GetWindowsVersionEx(Ver);
  Result :=
    (Ver.ProductType = VER_NT_SERVER) and
    (Ver.Major = 5) and (Ver.Minor = 2) and (not IsWin64);
end;

function IsWindowsServer2003_64Bit: Boolean;
var
  Ver: TWindowsVersion;
begin
  GetWindowsVersionEx(Ver);
  Result :=
    (Ver.ProductType = VER_NT_SERVER) and
    (Ver.Major = 5) and (Ver.Minor = 2) and IsWin64;
end;

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See also Determine Windows version in Inno Setup.