When I compile the same C source file using C51 V5.10 under WIN95 and NT 4.0 I find that the OBJ files generated under NT 4.0 don't match those generated under WIN95. When I perform a binary file comparison: FC /B file1.obj file2.obj I always find 3 or more byte locations that don't match. Has anyone else experienced this problem, and is it an NT or C51 V5.10 issue ? There are no compilation error messages. Also, the files compiled under NT don't run correctly.