I have had Windows 10 since it first came out and have been running a DOS game called Sherlock with no problems until last week (May 2016) when it stopped opening in Fullscreen mode. I was using DOSBox-0.64 and have now downloaded DOSBox-0.74. Still, when I try to run Sherlock in Fullscreen, it no longer goes to Fullscreen. I changed "DOSBox 0.74 Options.bat" to "Fullscreen=true" and this has had no effect. My monitor screen size is 1920x1080. Does anyone have suggestions for correcting this problem.