Windows 10 ISO content looks odd ("." directory)

I've downloaded Windows 10 Disc Image from microsoft.com recently. I mounted it using Archive Mounter in Ubuntu. And I saw just a hidden folder "." and an empty "README.TXT" file in the root. ls -aR result is .: . . .. README.TXT The disk content looks strange to me, I have not seen this before, and I think it may be some kind of protection from file browsing. Because when I try to enter "." directory I remain in the same directory. I know that "." has a special meaning: What do “.” and “..” mean when in a folder? - and this's probably a reason why I can't enter "." directory. - Is it really a trick from MS to hide disk internals? - Do you know any anti-trick? =) --- SHA1: 87b7a45c8fd9f016126230399c7e3a470b2ca1da SHA256: 3dfbd43a1163ee420464a604cd876ac3070606dd72d4abfa5f6e3f1f4f68d08e filesize: 4.1 GB They don't match anything on the internet, but MS MVP says : > The checksums are all over the place, you are not gonna find one thats the same to match what you downloaded. --- UPD: I've redownloaded the disk image and now its size is 4.7 GB and its checksum matches the one provided by @Ignacio Vazquez-Abrams . The above question is still actual: when the image is mounted using Archive Mounter its content looks odd, but when it's "burned" to USB I can see installation files and browse freely.