If the format is text based, then open it in a text editor. Often the name of the program is embedded in the header near the top of the file, or search the file with a Linux utility such as “strings”.
It’s also likely that TI has some user forum and this has popped up there before, so you should consider searching there or asking there which programs they use.
Yes this was orcad / cadence. There is a free viewer available, which is fine for viewing the layout of evaluation board / not planning on duplicating it.
I open the TI Gerber files and use thema s graphic layer in KiCad to place new tracks on each layer.
This is where KiCad really needs a lot more spare layers
I can view the files with the allegro viewer which is good enough for my uses. No gerbers included with this one, required request to TI for them to send it.