Section 8.3: help in programs Up Chapter 8: Help system Section 8.5: Compatibility 

8.4 Decompiling

The command unmkmessage can be used to decompile an Informix compiled help file (usually with a .iem suffix) as follows:
unmkmessage myhelp.iem myhelp.msg
or
unmkmessage myhelp.iem > myhelp.msg
If you omit the 2nd filename, the unmkmessage program will output to the standard output stream (by default , your screen).
The unmkmessage program is useful when you lose or corrupt the source helpfile but still have the original binary.
 Section 8.3: help in programs Up Chapter 8: Help system Section 8.5: Compatibility