I have an interface developed using IBM ACE v11 which is designed to receive an input file encoded with CP1252 and generates an output file with the same encoding. To test the interface using RIT on windows system, my test case includes following steps
As an alternative, I also wrote test case where I include the input file content directly in Publish step to write the content to input directory of the interface. I faced same issue with this approach as well.
I recall this issue arrive as a Salesforce ticket, please confirm