Toolsets are saved as files and you can open them, save them, and create new ones just as with any file. Vensim will only allow you to open one Sketch Toolset and one Analysis Toolsets at a time. Opening or starting a new toolset closes the old one. When you exit Vensim, it remembers the toolsets you were working with and next time Vensim starts with these toolsets loaded. If Vensim cannot find the toolset you were last using, it will open the default toolset.
Toolset files are stored as text files to allow transfer across platforms. Analysis toolsets are stored with extension .vts and Sketch Toolsets are stored with Extension .sts. By default, all Toolset files are stored in the same directory Vensim is installed in. You can store toolsets wherever you like, but using the Vensim directory is most convenient because that is the directory that will be referenced when you ask to open a Toolset.
Generally, you should modify Toolset files only from within Vensim, using the techniques described in this chapter. However, if you want to edit a Toolset file, perhaps to reorder the tools, you can do so with any text editor. The format of the files is straightforward, although you must be careful not to remove fields, since this can cause unpredictable results.
