Version always incrementing even if project not changed

[ajensen]

We have a large build file that builds something like 150 solution files. Each of these solutions only has one project underneath, so I suppose we could build the project files instead if it's necessary. The problem here is that we have it set to increment the version, which it does...but it does so every time the build runs whether the files have changed or not. What actually causes the version to increment and how can we get it to only increment when a project actually changes? Right now we have all files at the same version and can't tell which have changed or not.