convert file://home to Windows Absolute Path like C:/user/mab/cn1

These are behaviors of the JavaSEPort which normally you shouldn't run into since that's for the simulator. From your other question I understood you're just trying to use storage serialization locally, that would just work with native files. Since the desktop port uses the native filesystem and doesn't use the home directory special case.

To understand how we work with file URIs internally see: https://github.com/codenameone/CodenameOne/blob/9fd6369bb4a83d8bf47816e7c042c506a9cca260/Ports/JavaSE/src/com/codename1/impl/javase/JavaSEPort.java#L9647