Compiled text font and shape files were made compatible by using the Binary I/O package within SHCOMP.C when compiling a shape file and in SHLOAD.C when loading it. The shape files written by the modified code are identical to those generated by an MS-DOS AutoCAD but are incompatible with other systems. All .SHX files on non-MS-DOS systems must be recompiled when converting to this release of AutoCAD. Attempting to load an old format file results in an I/O error message. It was my judgement that considering the tiny installed base of non-MS-DOS systems, it just wasn't worth putting in some form of level indicator and generating a special message. This code has never been tested with ``big fonts'' (e.g., Kanji).