Does MessageBox change the directory? If I comment it out the midi file is found on both computers.
if(MessageBox(NULL, "Click Yes to go to full screen (Recommended)", "Options", MB_YESNO | MB_ICONQUESTION) == IDNO)
dwStyle = WS_BORDER | WS_SYSMENU; // If we don't want full screen, open a simple window
else // If we chose YES
bFullScreen = TRUE; // Set our boolean to TRUE, we wanted fullscreen
// This is the style that we need our window to have in order to be windowless fullscreen
dwStyle = WS_POPUP | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
// This changes our screen to full screen with our desired resolution