On a freshly installed ooRexx 3.1.1
Created a test.rex containing
say 'Hello, World!'
Then in the command window
rexxc test.rex test.exe
It sits for about 5 seconds and then the message box pops up:
C:\WINDOWS\System32\cmd.exe - test
The NTVDM CPU has encountered an illegal instruction.
CS:0eee IP:03ac OP:0f 03 c8 bf 70 Choose 'Close' to terminate the application.
On IBM's version Rexx 2.1 it would not give this error message but still would not execute--it would just end.