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From: Greg.Smith@bohemia.UUCP (Greg Smith)
Newsgroups: comp.os.msdos.programmer
Subject: Re: .com and .exe files
Message-ID: <92.2730D05F@bohemia.UUCP>
Date: 1 Nov 90 14:39:00 GMT
Organization: Bohemia BBS- MetroNet Gateway. Boulder, CO.
Lines: 22


St>renaming .exe file to .com files, and .com to .exe.
St>Imagine my suprize
St>when they all still worked!  This is not right by my
St>knowledge of dos.
St>Btw, I am using dos 3.3 with 4dos 4.03a.
(If 4Dos 4.03a is around I would like to know.  I have 3.02a)
The extensions of the files are mainly there for our referance.  The way the 
computer differentiates (sp) between the files is the header at the 
beginning of the file.  on EXE's  an  "MZ" will be the first two bytes in 
the file, while com files start out with actual code.  Also, following the 
MZ is a Program Segment Prefix(PSP) which defines many other needs, and 
memory/stack useage terms.

                                         Greg  
 
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