Recently code was added to look for jfxrt.jar file inside the JRE, in support of a true co-bundle. However, since this is not the way we ship it on Windows we need to suppress the warning message if it isn't there.

For example, I get the following error when running a standard installation of JavaFX (after which the program runs normally):

Unable to read C:\Program Files (x86)\Java\jdk1.6.0_30\jre\lib\jfxrt.jar