There are two ways of using dosbox:
1) (This way any changes you make to dosbox config will be loaded and used)
Start dosbox
Command
Mount D: C:\games\dosgames\Xcom3
The folder C:\games\dosgames\Xcom3 would then be mounted as D:
then just change to D: (type "D: ") and start the game ("xcomapoc")
2) (This way is foolproof (i.e. my favourite
but any changes you have made to the dosbox config are disregarded for some reason)
Open the folder with the game
Open the folder with DOS-Box in a second window
Drag the executable from the game
onto the DOS-box.exe file. Windows will then try to start the game using dosbox; the gamedirectory will be mounted as C: automatically and the game starts.. huzah! :Brain: