Why does my browser show XML-like file when i launch RxNav?
This is most likely happening because your web server is not aware of the proper MIME type for JNLP files. Java Web Start requires only one change to your web server, that is creating an association between the file extension, typically jnlp, and the MIME type, application/x-java-jnlp-file. The steps for doing this vary depending upon the web server you are using.
My browser seems to find the JNLP file, but Java Web Start says it can't find it.
This situation usually happens when your browser and your copy of Java Web Start have different proxy settings. To fix this problem: