Toolbar paths

Is anyone aware of how to use something along the lines of %userprofile% within the Toolbar.prf file? Example: Current line reads as follows... ToolbarUserItem: -2;C:\ptc\Program\Macros\Import_from_Illustrator.jpg; Want this to be something like this instead... ToolbarUserItem: -2;%userprofile%\\Application Data\PTC\IsoDraw\Macros\Import_from_Illustrator.jpg; Any ideas?