Vaiper

Maybe there is something wrong with your game, or dosbox itself. To solve it, i suggest to play ufo defense with "extender" mod, which improves gameplay and fix many bugs (and also have an option to enhance the game soundtrack with any mp3/ogg of your choice) Check more info on this link (working well with xp/win7 x32/x64)

I have a solution how to fix mp3 crash on ufo defense with extender mod. Check out this thread for info

Hello My friend was having excatly same problem. Altought on this site is mentioned what Microsoft Visual C++ 2008 Redistributable Package is required, he claim what it is installed already. Further investigation showed, what if soundtrack format is changed from mp3 to ogg, everythink is playing good and without crashes. So the solution would be convert stuff to ogg. You can convert yourself all mp3 to ogg and edit accordingly ini file, or download already prepared stuff with appropriated edited UFOExtender.ini Download link ; Mirror Install by simply extracting contents to root ufo defense folder and overwriting UFOExtender.ini file when asked