The reason for the "preview" is the msysGit repository in the HowToRelease.txt file.
I think msysGit is approaching the criteria suggested by:
A setup executable is named as follows - it starts with Git; - followed by the official git version if the release is closely related to a specific version of official git; - followed by * preview<date>, for snapshot builds. * winrc
Given the overall quality and stability of msysGit, there may be an alternative that better reflects this feeling in the msysGit list msysgit@googlegroups.com
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