Can't save in Vim for DOS in DOSBox [closed]

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http://serverfault.com – I need to work in DOS, so I installed the 16 bit Vim (found at the Vim website) in a folder using DosBox. When I first open a file it lets me save the file using :w. I continue editing, and want to save again and it says it can't write the file!? How can I fix this? Here are some screenshots: (HowTos)