Stata 11 -mac Osx-.zip [better] -

Data Editor: A revamped Data Editor allowed for better live viewing and filtering of datasets. System Requirements and Compatibility

The .zip extension itself is a clue: In 2009, macOS still handled .zip natively, but many academics used StuffIt. The fact that someone chose .zip suggests they wanted cross-platform compatibility—likely a Windows user exporting to a Mac colleague. Stata 11 -Mac OSX-.zip