anchor.diff:          let di = getDirectoryInfo localNugetPath root
           let nupkg = findLocalPackage di.FullName packageName version
           
  -        fixDatesInArchive nupkg.FullName
  +        fixArchive nupkg.FullName
           use zipToCreate = new FileStream(nupkg.FullName, FileMode.Open)
           use zip = new ZipArchive(zipToCreate,ZipArchiveMode.Read)
           
  
positive.code:         else
              Directory.CreateDirectory(targetFolder) |> ignore
  
              fixDatesInArchive fileName            
              ZipFile.ExtractToDirectory(fileName, targetFolder)
  
              // cleanup folder structure
  
negative.code:             raise exn
              return! getDetailsFromNuGetViaOData auth nugetURL packageName version
      } 
  
  let fixDatesInArchive fileName =
      try
          use zipToOpen = new FileStream(fileName, FileMode.Open)
  