For many years, I have used a 1990s DOS baseball statistics program called Diamond Data (diamond\data.exe). In 2012, my new computer had Windows 7, which does not support DOS. Early that year, my son used DOSBox to allow me to use this program. This worked well for more than 3 years; then a few weeks ago, DOSBox stopped launching the program, with this error message: "5 - Unable to launch application. Please contact us for corrected copy." My son tried relaunching the program from the original version he had used in 2012, but we got the same failure and error message. If anyone has ideas about how to launch this program successfully once again, I would very much appreciate hearing suggestions.