The Windows End User Defined Character (EUDC) support is used as a fallback, but only if a character cannot be found in the other fonts specified by the font configuration. The characters in the Unicode private use area typically come from the dingbats, symbol, or symbols character subsets. These are typically mapped to the following fonts: dingbats uses Wingdings, symbol uses Symbol, and symbols uses Segoe UI Symbol. Since the Windings, Symbol, and Segoe UI Symbol fonts typically exist on Windows, the characters are taken from there. In order to prevent this, exclusion ranges for the Unicode private use area (e000-f8ff) need to be added for the dingbats, symbol, and symbols character subsets.

The following information describes the Java font configuration files: https://docs.oracle.com/javase/8/docs/technotes/guides/intl/fontconfig.html.

In testing, the following changes allowed this to work on our Windows system with the some sample EUDC files installed.

1. Make sure IBM i ACS is not running
2. Go into the JAVA_HOME\lib directory (on the test system that was C:\Program Files\Java\jre1.8.0_121\lib)
3. Copy fontconfig.properties.src to the an easy to find location like Desktop as fontconfig.properties
4. Edit fontconfig.properties with a text editor
5. Add the following lines after the other exclusion.* lines and save the file (in the test environment file these lines were added at line number 249)

exclusion.dingbats=e000-f8ff
exclusion.symbol=e000-f8ff
exclusion.symbols=e000-f8ff

6. Copy the altered fontconfig.properties file to the JAVA_HOME\lib directory as fontconfig.properties
7. Start IBM i ACS

The expected EUDC characters should now display.