From Xojo Documentation
A short text description for the app. Usually this contains just the version number (such as 126.96.36.199) and is displayed by some operating systems in Get Info or Property windows for the app. This property can be set only in the IDE.
Typically version numbers are written as 188.8.131.52.
Version is displayed by the file information windows on macOS (Finder, Get Info) and Windows (Windows Explorer, Properties).
Display the short version: