Processing 3.0 launch() function doesn't launch my .exe - processing

Question

Processing 3.0 launch function doesn't launch my .exe.
I am using the Launch() function (https://processing.org/reference/launch_.html)
launch("C:/Program Files (x86)/Google/Chrome/Application/chrome.exe");
Or
launch("C:/app/keyboard.exe");
Result: Chrome browser will open. keyboard.exe will not. I've tryed different locations and relative paths.
I only get a windows loader when the link is correct. So that is correct.
The function discriptions says this:
"Be sure to make the file executable before attempting to open it (chmod +x). "
https://superuser.com/questions/106181/equivalent-of-chmod-to-change-file-permissions-in-windows
I also made a .bat file to execute the .exe but the launch() function only works on exe files.
but that didnt work either.
System:
Processing 3.0
Java 8
Windows 10, 64 bit
So what am I missing?

Answer 1

It is a bit dodgy but works in windows 8:
PrintWriter output=null;
output = createWriter("myfile.bat");
output.println("cd "+sketchPath(""));
output.println("start archivo.exe");
output.flush();
output.close();
output=null;
launch(sketchPath("")+"myfile.bat");
And you can choose another relative or absolute path
for instance
output.println("cd ..");
output.println("cd directoriy");
...

Answer 2

As Samuil advises, Windows uses \ instead of a / as a separator character, which you'll need to escape, hence \\: launch("C:\\app\\keyboard.exe");
I recommend using File.separator:
launch("C:"+File.separator+"app"+File.separator+"keyboard.exe");
It's a bit longer, but will work regardless of the operating system(Linux/OSX/Windows/etc.).
Aside launch(), also try exec():
exec(new String[]{"start","C:"+File.separator+"app"+File.separator+"keyboard.exe");
also Process. (If you need to check the output, you may need to write your own thread that will pipe the output)