EXE2COM (PSP Soft)
EXE2COM, by PSP Soft and Paul Shpilsher, is a DOS utility that converts an EXE file to COM format.
It supports most EXE files that are sufficiently small, and that don't have an overlay.
Disambiguation
This is not the only utility named EXE2COM, but most of the others don't have a distinct file format.
For example, there's exe2com by Chris Dunford and Cove Software: [1].
Identification
(Based on v2.00, which might be the only version.)
Files start with byte 0xe9
, and have ASCII "EXE2COM 200
" at offset 3.
Note: The EXE2COM.COM file itself has this signature, though it does not seem to conform to EXE2COM format.
A more precise test would be that the byte sequence e8 00 00 5b 81 eb 1d 00 8d b7 00 00 bf 00 01 b9 07 00 f3 a5
... appears at offset {3 + {the 2-byte integer at offset 1}}.