Add number of build

Good idea, I find that it is easy to make changes and forget to update the version number in project properties.
A hint for getting unique identification of the version of the project file could be to look at the Project Checksum.
This is not incremental like a build number is, but it is automatically recalculated for any change you make to the Project file.

Project Cheksum is great but is not incremental ... and it is impossible to know which is the last build (except you write each time the cheksum in excel file ...). Your software use build number why not our ?

I like this idea. The automatic increment could probably be based on number of saves since you changed the manual version. Since there is no build of the project file, the number of saves could fit the same purpose for version tracking. Adding something else, such as total number of days since created (like for the IQAN PC tools) could increase the chances of having a unique incremental number.