ot: getting a "coff"

[Bert Thomas]

Ron Hudson wrote:
> 
> Several of the programs I try to run on my "classic dos" machine give
> the error message:
> 
> <filepath\filename>:not coff (check for viruses)
> 
> I don't yet have a virus scanner, but these files were downloaded from
> trusted sources
> I don't think I have a virus. What is this error message?

http://www.webopedia.com/TERM/C/coff.html

(Just googled, not from experience)