Portions of DX11.1 are being made available to Windows 7 users via the new IE10 Preview for Windows 7. If you don't wish to use the browser but do want the extensions then a standalone is available here:
Download:
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When the image was captured there was system drive compression enabled. Is it possible to edit WIM image without deploying and re-caputing it to untick "Compress this drive to save disk space."?