It is the Windows 8.1 user. The Windows 8.1 loads the iso file vhd file in the virtual drive for its own. With the work with the winreducer81 program The iso,vhd file doesn't become a mount if I test I appear this phenomenon in a v1.13~1.17. The iso,vhd file mount function operates normally in the v1.12 version before. I never do English and cannot explain in detail and I am worm-eaten.