An stv file extension is related to the SofTV Author authoring data format.
STV file extension - sofTV authoring data
What is stv file? How to open stv files?
File type specification:
The stv file extension is used by SofTV Author, a software for Microsoft Windows, which enables users to create web pages with embedded video data.
The stv file stores authoring data.
This stv file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.