Visio Macro-Enabled Stencil File (.vssm) are Microsoft Visio Stencil files that support provide support for macros. A VSSM file when opened allows to run the ma...Visio Macro-Enabled Stencil File (.vssm) are Microsoft Visio Stencil files that support provide support for macros. A VSSM file when opened allows to run the ma