The situation is that I have a portable application that needs to have set environment variable. Other way it tries to set it's settings in user program data dir.

To avoid running the executable in non-portable mode (to avoid allowing it to run without any parameters) I erased the file's ".exe" extension, but then I cannot run it not only by mouse (which I want) but also through start command.

Is there any way to run such executable file that has no exe extension ?

  • Your question is not really clear. If you accidentally deleted the .EXE extension, why can't you add it back? What's preventing you from doing so?
    – Karan
    Jul 16 '13 at 1:42
  • I've deleted it on purpose to not accidentally hit it so the program would run without any parameters. I want to be safe to only run the program with options at start.
    – rsk82
    Jul 20 '13 at 22:20

Yes – simply entering the program's full filename usually works. (The .exe requirement only exists in the GUI shell.)

(It might be that the file needs an extension, though – so if you can't get MyProgram to run, rename it to MyProgram.notexe or MyProgram.lol and try again.)

  • 1
    This surprised me once, when I renamed a self-extracting Zip file from .exe to .zip, tried to open it through cmd.exe, and it still ran the self-extractor instead of opening WinZip.
    – user1686
    Jul 15 '13 at 10:37
  • I didn't know the trick with changing extension, that program might need some dummy one, thats not so intuitive. But anyway I encountered another bummer that is the application itself needs its main executable to have a strict name.
    – rsk82
    Jul 15 '13 at 10:44
  • 1
    Anything that starts with MZ will be executed by cmd, check below Sep 16 '16 at 13:56

Any file with any extension and first two bytes MZ will be treated like an EXE.

Try following:

  1. Create a new a.txt file,
  2. Type in it MZ, save it.
  3. Open cmd, go to its folder,
  4. Type a.txt and see the error message.

Replace MZ with MS and try again - this time notepad will run with file opened.

  • 1
    Doesn't work in Windows 10. It always shows '' is not recognized as an internal or external command, operable program or batch file. error
    – phuclv
    Mar 22 '18 at 4:35
  • I've just tried at home with in Windows 10 Pro and it indeed shows an error This version of D:\test.txt is not compatible with the version of Windows you're running. Check your computer's system information and then contact the software publisher. previously I used Windows 10 LTSB at work and it didn't work
    – phuclv
    Apr 7 '18 at 16:46
  • It still works on my Windows 10 X64, the same example as above. Nov 7 '18 at 15:12
  • If you try to execute a file without any extension, it will throw a 'file' is not recognized error.
    – Stevoisiak
    Oct 14 '19 at 17:03

I tried to run process from file without the .exe extension. When I failed to do so from cmd.exe I give a try some powershell commands. Here is one:


The documentation says about Default syntax and UseShellExecute. With just:

Start-Process -FilePath .\my-program -Wait -NoNewWindow

the command uses UseShellExecute syntax and returns error about not associated application to that file type. To force the Default syntax I added parameter that the UseShellExecute doesn't have:

Start-Process -FilePath .\my-program -Wait -RedirectStandardError ./error.txt -NoNewWindow

My program was started and wrote output to the console. This was enough for me, because I needed it only for test purpose.

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