Downloaded Chadwick 0.4.0 for Windoze & also the 0.5.0 utilities. Everything runs nice.
Now, how to organize teams from different years. Everything’s based off the season year. I picked 2008. You need a TEAM2008 file. For Group A this looks like:
BAL71,A,Baltimore,1971 Orioles NYN73,N,New York,1973 Mets OAK72,A,Oakland,1972 Athletics ATL69,N,Atlanta,1969 Braves CIN64,N,Cincinnati,1964 Reds MIN69,A,Minnesota,1969 Twins
I added the last two digits of the actual year to the team ID and put the full year in the nickname field. I copied in the Retrosheet roster files, but renamed them to have the team IDs and 2008:
ATL692008.ROS BAL712008.ROS CIN642008.ROS MIN692008.ROS NYN732008.ROS OAK722008.ROS
Zipped up the team & roster files into 2008.zip and opened that (open, not import) from Chadwick. Works!