The FreeEdgeTreatmentSym.vbp project defines free edge treatment symbols.
Visual Basic Project: [Programming Resources Folder]\Programming\ExampleCode\StructDetail\Symbols\EdgeTreatmentSymbols\FreeEdgeTreatmentSym.vbp
Compiled Rule: [Reference Data Folder]\SharedContent\Bin\StructDetail\Symbols\Release\EdgeTreatmentSymbols.dll