Workarounds to some (appearance and locale) problems :

1. Cannot open recent files with unicode filenames: Create an environmental parameter with the name "JAVA_TOOL_OPTIONS" and set its value to: "-Dfile.encoding=UTF-8"
2. Awful icons in toolbar: In "JAVA_TOOL_OPTIONS" add "-Dsun.java2d.uiScale=1.0". Drawback: smaller characters in plot view.
3. For a more "Windows" look and feel add in "JAVA_TOOL_OPTIONS":
"-Dswing.aatext=true -Dswing.plaf.metal.controlFont="Segoe UI Normal-15" -Dswing.plaf.metal.systemFont="Segoe UI Normal-13" -Dswing.plaf.metal.userFont="Segoe UI Normal-15" -Dawt.useSystemAAFontSettings=lcd"
4. Dealing with the small numbers problem in a calibration bar (i.e. numbers smaller than 0.1 are not interpreted correctly - see other post in this thread). Add in "JAVA_TOOL_OPTIONS" the value "-Djava.locale.providers=COMPAT,CLDR,SPI".

All solutions are working with the bundled Java verion (9.0.4) and newers.