In File Explorer, go to the tab and check the box for File name extensions .
If you see u4.exe listed there, restore the file and add an "Exclusion" for that folder so it doesn't get deleted again. 3. DOSBox Configuration (For Ultima IV) u4.exe does not exist
Ensure the "mount" command points to the correct folder. If the path is wrong, DOSBox will look in a "virtual" C: drive that is empty. 4. File Extension Hidden In File Explorer, go to the tab and