I know that DOS is supposed to be for windows but i have a Mac and i keep trying to open this one file and this little screen comes up that says "This program cannot be run in DOS mode". My computer has windows stuff like Word if that makes any difference. I know next to nothing about computers and I need some help please!
Word is a Microsft program, not a Windows program, so therefore irrelevent. Regarding your problem, it ia a non problem, you are trying to open a Windows file on a MAC, presumbly OSX O/S. What is the file extension of the file ??
To state Macintosh, that is too general a description of the Computer or Laptop !!
DOS and Windows are both operating systems, actually. As X86 asks, what type of file are you trying to open? From where did you get the file? More information would allow us to help you. :)