why we use .ejb file

I was asked to read the code of an existing project开发者_Go百科. There they have implemented stateless session bean with the file extension .ejb. We can have java file which extends sessionbean but wats the use of keeping the file as .ejb ? Anyone can help me out this ? Thanks in Advance.

You use it likely because your project uses EJBGen, which uses .ejb as file extension for files to be treated specially (source for code generation).