This is with EnvInject plugin 1.72, Jenkins 1.488.
In a job configuration, "Build Environment" --> "Inject environment variables to the build process", the help text for "Properties File Path" says "the process is executed before a SCM checkout".
However, when I run it, it's quite clear that this is processed AFTER the SCM checkout - which is good, since it means I can have my properties file under source control.
The console shows this:
The help text needs changing so that it describes what actually happens.
The same wrong help text appears when you have a "Build Step" of "Inject environment variables".