Files that contain the .hst file extension are used by a variety of software applications to log a history of system events.
HST files come in many different formats, each custom to the software program that writes them. They are usually in plain text format so you can inspect them by opening them in a text editor like WordPad or similar. Usually they contain date and time and a description of the event that occurred.
The .hst file extension is also used for handmade software graphics files. These files contain the histogram files for the handmade software image.
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If you have additional information about the HST file format or software that uses files with the HST suffix, please do get in touch - we would love hearing from you.