/tmp>echo '#!/tmp/defrag.exe' > demo
/tmp>echo 'echo Hello from the shell' >> demo
/tmp>chmod +x demo
/tmp>./demo
-bash: ./demo: /tmp/defrag.exe: bad interpreter: Permission denied
/tmp>chmod +x defrag.exe
/tmp>./demo
Hello from the shell
/tmp>./defrag.exe
-bash: ./defrag.exe: cannot execute binary file: Exec format error
/tmp>