The feedback was quick and consistent: Marking files vital by default is a good thing. So in the next weekly release of WiX, files will get the msidbFileAttributesVital attribute by default. The FilesVitalByDefault property and -fdvital switch have been removed; in their place, SuppressFilesVitalByDefault and -sfdvital turn off the default “vital” behavior.
Joy of Setup
Bob Arnson’s blog about setup and servicing
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[...] By default, files now get the “vital bit” (msidbFileAttributesVital). [...]