He didn't have a chance to look too closely when he was a vendor at MSFT: - build.exe is not perl. Perl (and many other tools) have been used to do specific ta

He didn't have a chance to look too closely when he was a vendor at MSFT: - build.exe is not perl. Perl (and many other tools) have been used to do specific tasks within the build, but build.exe is essentially a makefile driver. You can read documentation on it in the Windows Driver SDK. - FCIBs (* checked in binaries) were the exception, not the rule. But sometimes, you have something from a third party that you don't have source access to. Even when you're MSFT. Given the security review paranoia now, I would be shocked if any still exist. - robocopy doesn't fix "bugs" in xcopy; it supports mirroring and checksum validations. Let's put it like we're in third grade again -- robocopy:xcopy::rsync:cp. Robocopy is available via the Windows Server Resource Kit, last I checked five years or so ago. I'm sure this guy has had a bunch of interesting experiences and has a lot to share, but the lack of any investigation whatsoever of the tools he was using on a daily basis and wildly incorrect statements about them feels like a Fox News Special Report.