Default Vortex Source File Extension .vs

In Texis version 6, the default Vortex source file extension is ".vs" for clarity. Empty (no extension) is still accepted for back-compatibility. The source extension need not be specified on the command line nor URLs. Under Windows, a file mapping is added at installation to map .vs to Wordpad or another editor. The source extension is changeable (not recommended) in texis.ini via [Texis] Vortex Source Extensions (here).