OMG: Don Warner Saklad catches his white whale

As Universal Hub regulars and Boston-area Internet denizens know only too well, the omnipresent Saklad has been on a seemingly quixotic quest for years now to gain access to the records kept by the stenographer the Boston City Council for some reason continues to employ to record all of its meetings in this era of cheap audio and video recordings.

Brace yourself: This morning Saklad got one of those records! He opened his inbox to:

Per your request, attached please find the electronic file from this
week's council meeting.

Ann H. Braga, Esq. MPA
Staff Director
Boston City Council

But having cornered the whale, there's a new problem: How to open the file. It's in something labeled sgstn format. What the what the? Anybody have a clue how he can make the file usable? A copy is attached here if you want to take a look.