Why can I open my Stata .dta file?
The new version of Stata is not backwards compatible; in other words Stata 6 cannot open Stata 7 (the current version of Stata available at the Statlab) or Stata/Se files. However, the updated version of StatTrasfer (also available on Statlab computers) can convert files across all three file versions: 6, 7, and SE. If using Stata 6 at home, remember to use StatTransfer before leaving the lab.