title: how to open xbap file?
body: <p>how can I open .xbap file downloaded from internet?
  many Control vendor sites offers to download .xbap file to show WPF controls, but I cant Open them.
  Internet Explorer generates error:</p>
  
  <p><a href="http://img28.imageshack.us/i/capturenxs.png/" rel="nofollow">http://img28.imageshack.us/i/capturenxs.png/</a></p>
  
  <p>Error Log:</p>
  
  <p>ERROR DETAILS
      Following errors were detected during this operation.
      * [3/31/2011 2:23:10 PM] System.Deployment.Application.InvalidDeploymentException (ManifestParse)
          - Exception reading manifest from file:///E:/Downloads/ControlExplorer.xbap: the manifest may not be valid or the file could not be opened.</p>
  
  <ul>
  <li><p>Source: System.Deployment
      - Stack trace:
          at System.Deployment.Application.ManifestReader.FromDocument(String localPath, ManifestType manifestType, Uri sourceUri)
          at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestDirect(SubscriptionStore subStore, Uri&amp; sourceUri, TempFile&amp; tempFile, IDownloadNotification notification, DownloadOptions options, ServerInformation&amp; serverInformation)
          at System.Deployment.Application.DownloadManager.DownloadDeploymentManifest(SubscriptionStore subStore, Uri&amp; sourceUri, TempFile&amp; tempFile, IDownloadNotification notification, DownloadOptions options)
          at System.Deployment.Application.DeploymentManager.BindCore(Boolean blocking, TempFile&amp; tempDeploy, TempDirectory&amp; tempAppDir, FileStream&amp; refTransaction, String&amp; productName)
          at System.Deployment.Application.DeploymentManager.BindAsyncWorker()
      --- Inner Exception ---
      System.Deployment.Application.InvalidDeploymentException (SignatureValidation)
      - Manifest XML signature is not valid.</p></li>
  <li><p>Source: System.Deployment
      - Stack trace:
          at System.Deployment.Application.Manifest.AssemblyManifest.ValidateSignature(Stream s)
          at System.Deployment.Application.ManifestReader.FromDocument(String localPath, ManifestType manifestType, Uri sourceUri)
      --- Inner Exception ---
      System.Security.Cryptography.CryptographicException
      - No signature was present in the subject.</p></li>
  <li><p>Source: System.Deployment
      - Stack trace:
          at System.Deployment.Internal.CodeSigning.SignedCmiManifest.Verify(CmiManifestVerifyFlags verifyFlags)
          at System.Deployment.Application.Manifest.AssemblyManifest.ValidateSignature(Stream s)</p></li>
  </ul>