Under Windows 10 the command "db2icrt -? " dumps many strings "Unable to fetch help message" and "db2icrt -h" is also complaining.
C:\Program Files\IBM\SQLLIB\BIN>db2icrt -h
Message Library is not available
no valid hostname
C:\Program Files\IBM\SQLLIB\BIN>
It was a default install of Db2 11.1.4.4
C:\Program Files\IBM\SQLLIB\BIN>db2level
DB21085I This instance or install (instance name, where applicable: "DB2")
uses "64" bits and DB2 code release "SQL11014" with level identifier
"0205010F".
Informational tokens are "DB2 v11.1.4040.371", "s1807120100",
"DYN1807120100WIN64", and Fix Pack "4".
Product is installed at "C:\PROGRA~1\IBM\SQLLIB" with DB2 Copy Name "DB2COPY1".
Kind regards
Roland Schock