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    <p>A very primitive check would be to check for the file extension:</p> <pre><code>Path.GetExtension(filename).Equals(".exe", StringComparison.InvariantCultureIgnoreCase); </code></pre> <p>However, Windows supports a variety of extensions for executable files (e.g. .cmd, .com, .cpl, .scr and <a href="http://antivirus.about.com/od/securitytips/a/fileextview.htm" rel="nofollow noreferrer">many more</a>), so the check above would not cover all executable files.</p> <p>As mentioned by others, you can also check the magic numbers in the file header for the existence of e.g. MZ (and some other more rare signatures). This second check could be used in addition to checking the extension(s) though you can never be certain that the file is not a simple text file accidentally starting with the same text.</p> <p>If you are going to start the executable to be checked anyway, then it is probably safest to simply start it with proper exception handling:</p> <pre><code>const int ERROR_BAD_EXE_FORMAT = 193; try { ProcessStartInfo psi = new ProcessStartInfo(); psi.UseShellExecute = false; psi.FileName = @"C:\tmp\testOLElocal_4.docx"; Process.Start(psi); } catch (Win32Exception ex) { if (ex.NativeErrorCode == ERROR_BAD_EXE_FORMAT) { // The exception message would be // "The specified executable is not a valid application for this OS platform." // Console.WriteLine("Not a valid executable."); } else { throw; } } </code></pre> <p>NB: You didn't mention any details about your own application, but whenever executing code which comes via user input you should make sure that your user can be trusted.</p>
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    1. POHow to find if a file is an exe?
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    1. USDirk Vollmar
    1. USDirk Vollmar
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    1. COTest if it burns by putting your hand within? you'll sure have an answer, but I'm not sure it's really what's the OP had in mind ;o)
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    2. COWhat if I pass destoroyeverything.exe?
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    3. CO@Vinzz, of course you can always check file extensions and magic numbers, btu to be definitely certain that the file actually executes you would have to try. And in case the application would start the file anyway proper exception handling would be the way to go.
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