diff --git a/MSDOS/des.exe b/MSDOS/des.exe
new file mode 100644
index 0000000..7ad21eb
Binary files /dev/null and b/MSDOS/des.exe differ
diff --git a/MSDOS/undes.exe b/MSDOS/undes.exe
new file mode 100644
index 0000000..f6905dc
Binary files /dev/null and b/MSDOS/undes.exe differ