The .stx file extension is most commonly used with the Pinnacle Studio video editing program. The STX files are project files that are created with the software. These files contain the project settings of the video as well as references to other media and data files that are used by the Pinnacle Studio project.
The .stx file extension is also used for CA-Simply Tax tax form files, SmarText electronic book files, SPOT Image statistics files, Terrasoft SAS data files, ArcView statistics files and Eschalon setup install script files.
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If you have additional information about the STX file format or software that uses files with the STX suffix, please do get in touch - we would love hearing from you.