Returns the path to the Softimage installation directory, the
current user directory and other useful paths. This makes it
possible to write scripts that do not rely on hardcoded paths and
which work on any user's machine.
The returned paths do not include a trailing path separator
character.
Note: In the case of multiple workgroups this method returns only
the first workgroup (when called with siWorkgroupPath or
siWorkgroupAddonPath). The best way to retrieve the full list of
active workgroups is via XSIApplication.Workgroups.
Note: This is the Python-compliant version of XSIApplication.InstallationPath.
Since Python does not support input parameters on properties,
XSIApplication.InstallationPath will fail in Python.