Any string value for a property may contain environment variable references using the $(name) or $ {name} notation. These will be replaced with the value of the environment variable when used by the IDE. If the environment variable is not set, the reference will be replaced by an empty string. The system environment, as modified by the project-wide or per-file environment property (if defined), is used to expand variable references.
Special Environment Variables
The following special variable names are defined by Wing IDE for use in the $(name) or ${name} form:
These may evaluate to an empty string when there is no current file name.