Issue/Error: "A 32-bit version of SharePoint Server is not installed. Please install a 32-bit version of SharePoint Server"

When I was trying to create workflow project by using Visual Studio 2008, I faced above issue.

WSS Extensions from Microsoft (released in Feb 2009):
http://www.microsoft.com/downloads/details.aspx?FamilyID=b2c0b628-5cab-48c1-8cae-c34c1ccbdc0a&DisplayLang=en

Note: Installing above extensions didn't work for me. Try your luck.

Alternative Solution: WSPBuilder
Instal WSPBuilder extension for Visual Studio installed (www.codeplex.com/wspbuilder)

• In Visual Studio 2008, File > New > ProjectSelect WSPBuilder and then Select then WSPBuilder Project with WorkflowClick OK
• In the Solution Explorer window Right Click on the Projet Name (for example, WSPBuilderProject1)> Add > Sequential Workflow
• In the add New Item Window that just open, select Workflow categorie and the Sequential Workflow And then , click on the Add button.Witch templates do you prefer : With code separation or with code ?

I hope the issue resolved by now.