Byte code files have a file extension of '.ujbc' (for example 'foo.ujbc'). A byte code file consists of the binary code for a UJML player, compiled from an application or partition file. See Application Files, Partition Files, Compiling. Byte code files are not human readable. 

A compiled UJML file has the same name as its source file, with the byte code file extension. For example, the file 'bar.ujml' compiles to the file 'bar.ujbc'.

Application Files, Partition Files, Compiling