This is my (partial) directory structure:

 [C:\inetpub\wwwroot\FlexWiki]
   [admin]
   [bin]
   [emoticons]
   [images]
   [WikiBases]
     [MyWiki]
       HomePage Test.wiki
       _ContentBaseDefinition.wiki
   AccessDenied.aspx
   blade.aspx
   default.aspx
   dosearch.aspx
   dump.aspx
   EditService.asmx
   Global.asax
   lastmodified.aspx
   Login.aspx
   Logoff.aspx
   lostAndFound.aspx
   NamespaceMap.xml
   Newsletter.aspx
   Presence.aspx
   preview.aspx
   print.aspx
   quicklink.aspx
   Rename.aspx
   rss.aspx
   rssFace.aspx
   SafeMode.aspx
   search.aspx
   ShowNewsletter.aspx
   UserProfile.aspx
   Versions.aspx
   Web.config
   wiki.css
   wikiedit.aspx

This is the content of Web.config:

 <?xml version="1.0" encoding="utf-8" ?>
 <configuration>
  <appSettings>
   <add key="FederationNamespaceMapFile" value="/FlexWiki/NamespaceMap.xml" />
  </appSettings>
  <system.web> 
   <authentication mode="None" />
   <pages validateRequest = "false" />
  </system.web>
 </configuration>

This is the content of NamespaceMap.xml:

 <?xml version="1.0" encoding="utf-8"?>
 <FederationConfiguration xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <DefaultNamespace>MyWiki</DefaultNamespace>
  <About>If you're new to Wiki, read ""OneMinuteWiki"" or ""VisitorWelcome"".</About>
  <WikiTalkVersion>1</WikiTalkVersion>
  <DefaultDirectoryForNewNamespaces>.\WikiBases</DefaultDirectoryForNewNamespaces>
  <Namespaces>
   <Namespace Root=".\WikiBases\MyWiki" Secure="false" Namespace="MyWiki" />
  </Namespaces>
 </FederationConfiguration>

This is the content of HomePage.wiki:

 This is the homepage

This is the content of _ContentBaseDefinition.wiki:

 Title: MyWiki
 Description: Welcome to MyWiki
 Namespace: MyWiki