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Question by NOXITAILE
Submitted on 10/3/2003
Related FAQ: comp.os.msdos.programmer FAQ part 5/5
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Answer by M S RAM
Submitted on 1/4/2004
Rating:  Rate this answer: Vote
Following are the major differences b/w an EXE file and a COM file :
1.EXE file contains a header
  whereas a COM file does not.
2.EXE file may contain relocation items
  whereas a COM file can not.
3.The CODE,DATA and STACK segments of an EXE
  file may begin at different locations; that
  is an EXE program can contain more than one
  segment.But a COM has to contain only a
  single segment; thus the size of the COM
  file is limited to 64K.


Answer by Ravindranath
Submitted on 10/14/2004
Rating: Not yet rated Rate this answer: Vote
The very first two bytes of .exe file will be either MZ or ZM. DOS recognizes the command is either .exe or .com is by verifying this first two bytes


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