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#MICROSOFT OUTLOOK EMAIL SIGNATURE VERSION 17.7 UPDATE#

But we knew that apps will still break, and compatibility is hugely important, so we took another compatibility approach: we just lie.

#MICROSOFT OUTLOOK EMAIL SIGNATURE VERSION 17.7 UPDATE#

They are ACL'd to only allow the TrustedInstaller ACE to write to them, and this is handled by the TrustedInstaller service, which Windows Update calls into. So, in Windows Vista, we just don't let you write to Windows operating system files at all. Not my best night.Ĭlearly, there was room for improvement. Which makes it really hard to boot, because critical files are gone.

If you immediately say 'yes', then it reboots - without those Windows files. Then, before the few seconds had passed, it would prompt for a reboot. However, at uninstall, it removed all of these Windows files, because it thought it had dropped them. Fair enough, we would notice that the installer did that, and then copy the original files back, and no harm done. When they build the installer, apparently they weren't sure that Windows would be there. About 1 CD worth of content was most every file from Windows. I had one game application that had 4 CDs for the install. Second, the amount of time it would take to replace files might be too long. from the location you just put your stuff in! So you could get around it. They would then copy a file to that somewhere first, then copy the Windows file in its location, and when we triggered that it was changed we would copy it over .

However, there are a couple of issues with this.įirst, since we are copying the original files back, people figured out that the files had to come from somewhere, and they figured out where that somewhere was. It seemed like a good solution at the time. The application doesn't fail, but Windows still returns to a known and tested state. Essentially, we would watch these files, and if you changed them, we would go ahead and let you do that, but then we'd come along a few seconds later and replace them with the original version. On XP, we would address this with System File Protection (SFP). Of course, a lot of applications try to drop them anyway, and for application compatibility reasons we don't want to just break them. The operating system is no longer in a known and tested state. If an application then comes along and writes an older version of shell32.dll, it may no longer work with the newer version of user32.dll. For example, if we make a change to user32.dll, we may also need to make a change to shell32.dll to accommodate this change, so the update will contain both files. Windows Resource Protection is the feature we put in place to help keep Windows in a known state. I came across this problem today with a customer - Windows Resource Protection preventing ActiveX control installation on Windows Vista.įirst, some background.

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