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.