Opening .tbt files in toolbox

I downloaded a heap of .tbt files from the TLA and am trying to open them in Toolbox, but I keep getting the error “database type” not found. Does anyone know how to get the tbt files open in Toolbox?

If the corresponding Toolbox .typ file(s) (database type) is/are also available for download from the archive, it is best to download it/them too. Otherwise you would have to create a (basic) .typ file based on the information in the .tbt files, I guess.
I’m not a Toolbox expert, so maybe someone else knows a better and/or easier way to approach this.

-Han