MakeSchd is a DOS application that imports text format schedules into Commute's database. It can also export them backout as text. Version 1.32 must be used with Commute 1.31 or later as the record format was changed in 1.31 to allow for more than 200 departures in a schedule. Source is available below. Online Registration is available through Kagi.
Details are below.
Getting Commute Download Commute 1.33 now. The zip file contains the program, documentation, MakeSchd.exe, and a sample import.txt file. You can also read the documentation right here. For the curious, here's the C source for MakeSchd 1.32 and the header file for Commute 1.33 . Registering You can register for Commute online using Kagi .