diff --git a/build/xchat-wdk.iss b/build/xchat-wdk.iss
new file mode 100644
index 00000000..6d7fba99
--- /dev/null
+++ b/build/xchat-wdk.iss
@@ -0,0 +1,106 @@
+[Setup] 
+WizardImageFile=c:\mozilla-build\build\xchat-wdk\build\bitmaps\wizardimage.bmp 
+WizardSmallImageFile=c:\mozilla-build\build\xchat-wdk\build\bitmaps\wizardsmallimage.bmp 
+AppVerName=XChat-WDK 1498
+AppVersion=14.98.0.0
+VersionInfoVersion=14.98.0.0
+OutputBaseFilename=XChat-WDK 1498
+SetupIconFile=c:\mozilla-build\build\xchat-wdk\xchat.ico 
+AppName=XChat-WDK
+AppPublisher=XChat-WDK
+AppPublisherURL=http://www.xchat-wdk.org/
+AppCopyright=Copyright (C) 1998-2010 Peter Zelezny
+AppSupportURL=http://code.google.com/p/xchat-wdk/issues/list
+AppUpdatesURL=http://www.xchat-wdk.org/home/downloads
+UninstallDisplayIcon={app}\xchat.exe
+UninstallDisplayName=XChat-WDK
+DefaultDirName={pf}\XChat-WDK
+DefaultGroupName=XChat-WDK
+DisableProgramGroupPage=yes
+DisableDirPage=yes
+DisableReadyPage=yes
+DisableReadyMemo=yes
+SolidCompression=yes
+SourceDir=..\tmp
+OutputDir=..\build
+FlatComponentsList=no
+PrivilegesRequired=none
+ShowComponentSizes=no
+CreateUninstallRegKey=no
+Uninstallable=no
+ArchitecturesAllowed=x86 x64
+ArchitecturesInstallIn64BitMode=x64
+
+[Messages]
+BeveledLabel= XChat-WDK
+
+[Code]
+/////////////////////////////////////////////////////////////////////
+// these are required for x86->x64 or reverse upgrades
+/////////////////////////////////////////////////////////////////////
+function GetUninstallString(): String;
+var
+	sUnInstPath: String;
+	sUnInstallString: String;
+begin
+	sUnInstPath := ExpandConstant('Software\Microsoft\Windows\CurrentVersion\Uninstall\XChat-WDK_is1');
+	sUnInstallString := '';
+	if not RegQueryStringValue(HKLM, sUnInstPath, 'UninstallString', sUnInstallString) then
+		RegQueryStringValue(HKCU, sUnInstPath, 'UninstallString', sUnInstallString);
+	Result := sUnInstallString;
+end;
+
+
+/////////////////////////////////////////////////////////////////////
+function IsUpgrade(): Boolean;
+begin
+	Result := (GetUninstallString() <> '');
+end;
+
+
+/////////////////////////////////////////////////////////////////////
+function UnInstallOldVersion(): Integer;
+var
+	sUnInstallString: String;
+	iResultCode: Integer;
+begin
+// Return Values:
+// 1 - uninstall string is empty
+// 2 - error executing the UnInstallString
+// 3 - successfully executed the UnInstallString
+
+	// default return value
+	Result := 0;
+
+	// get the uninstall string of the old app
+	sUnInstallString := GetUninstallString();
+	if sUnInstallString <> '' then begin
+		sUnInstallString := RemoveQuotes(sUnInstallString);
+		if Exec(sUnInstallString, '/SILENT /NORESTART /SUPPRESSMSGBOXES','', SW_HIDE, ewWaitUntilTerminated, iResultCode) then
+			Result := 3
+		else
+			Result := 2;
+	end else
+		Result := 1;
+end;
+
+/////////////////////////////////////////////////////////////////////
+procedure CurStepChanged(CurStep: TSetupStep);
+var
+	ErrCode: integer;
+begin
+	if not (IsTaskSelected('portable')) then
+	begin
+		if (CurStep=ssInstall) then
+		begin
+			if (IsUpgrade()) then
+			begin
+				UnInstallOldVersion();
+			end;
+		end;
+		if (CurStep=ssDone) then
+		begin
+			ShellExec('open', 'http://www.xchat-wdk.org/home/downloads', '', '', SW_SHOW, ewNoWait, ErrCode);
+		end;
+	end;
+end;