Revision 278779

Not sure if it's the best solution but this changes the following:
- Enable plain filenames (without "file:" scheme) as URI. FOURIResolver tries to create a java.io.File to access the file.
- If after removing the scheme from a file: URL the string still contains a ":" it is likely an absolute Windows path for which the user forgot to specify a leading "/", i.e.:
file:C:/Temp/test.txt --> file:/C:/Temp/test.txt