If you have a mime type and you want to find the default
extension for it, you can get this from the Extension value in
the following registry key:
HKEY_CLASSES_ROOT\MIME\Database\Content Type\<mime type>
public static string GetDefaultExtension(string mimeType)
{
string result;
RegistryKey key;
object value;
key = Registry.ClassesRoot.OpenSubKey(@"MIME\Database\Content Type\" + mimeType, false);
value = key != null ? key.GetValue("Extension", null) : null;
result = value != null ? value.ToString() : string.Empty;
return result;
}
One the other hand, if you have a file extension and you want to
know what that mime type is, you can get that via the Content Type value of this key:
HKEY_CLASSES_ROOT\<extension>
public static string GetMimeTypeFromExtension(string extension)
{
string result;
RegistryKey key;
object value;
if (!extension.StartsWith("."))
extension = "." + extension;
key = Registry.ClassesRoot.OpenSubKey(extension, false);
value = key != null ? key.GetValue("Content Type", null) : null;
result = value != null ? value.ToString() : string.Empty;
return result;
}
Update History
- 2010-04-04 - First published
- 2020-11-21 - Updated formatting
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The founder of Cyotek, Richard enjoys creating new blog content for the site. Much more though, he likes to develop programs, and can often found writing reams of code. A long term gamer, he has aspirations in one day creating an epic video game - but until that time comes, he is mostly content with adding new bugs to WebCopy and the other Cyotek products.