Renamed default autoexec to avoid confusion with DOS/Windows

RunCPM/globals.h

@@ -223,7 +223,7 @@ static uint16	physicalExtentBytes;// # bytes described by 1 directory entry
 
 /* definition of an autoexec functionality */
 static uint8	firstBoot = TRUE;	// True if this is the first boot
-#define AUTOEXEC "AUTOEXEC.BAT"		// Name of the autoexec file
+#define AUTOEXEC "AUTOEXEC.TXT"		// Name of the autoexec file
 #define BOOTONLY FALSE				// If TRUE, the autoexec file will only be loaded on the first boot
 
 static uint32 timer;