I found solution here.
Run the below script from Deployment Tools Environment
:: Rename the original install.wim file. rename D:\sources\install.wim install.bak :: Create an empty temporary directory. mkdir D:\sources\dummy :: Create a new install.wim file with dummy image. dism.exe /Capture-Image /ImageFile:D:\sources\install.wim /CaptureDir:D:\sources\dummy /Name:dummy /Compress:Max :: Export the first Windows image to the empty install.wim file. dism.exe /Export-Image /SourceImageFile:D:\sources\install.bak /SourceIndex:1 /DestinationImageFile:D:\sources\install.wim /Compress:Max :: Delete the first dummy index in install.wim dism.exe /Delete-Image /ImageFile:D:\sources\install.wim /Index:1 :: Delete temporary directory. rmdir D:\sources\dummy
Now you can open install.wim in WSIM.
Also you can delete the original (install.bak) file and create the the bootable media using oscdimg.exe