I did use urlmon.dll in the end. I thought there would be an easier way but this works. I include the code to help anyone else and allow me to find...

Edit: Just use Mime Detective I use byte array sequences to determine the correct MIME type of a given file. The advantage of this over just looki...

I've found a hard-coded solution, I hope i will help somebody: public static class MIMEAssistant { private static readonly Dictionary<string, str...

You can also look in the registry. using System.IO; using Microsoft.Win32; string GetMimeType(FileInfo fileInfo) { string...

HeyRed.Mime.MimeGuesser.GuessMimeType from Nuget would be the ultimate solution if you want to host your ASP.NET solution on non-windows environme...

I use an hybrid solution: using System.Runtime.InteropServices; [DllImport (@"urlmon.dll", CharSet = CharSet.Auto)] private extern sta...

I wrote a validator of mime type. Kindly share it with you. private readonly Dictionary<string, byte[]> _mimeTypes = new Dictionary<string, byte[]>...

I think the right answer is a combination of Steve Morgan's and Serguei's answers. That's how Internet Explorer does it. The pinvoke call to Fin...