C# Signature:

/// <summary>
/// Retrieves a file's perceived type based on its extension.
/// </summary>
/// <exception cref="System.IO.FileNotFoundException">Unknown files extension</exception>
[DllImport("Shlwapi.dll", ExactSpelling = true, PreserveSig = false)]
static extern void AssocGetPerceivedType(
    [MarshalAs(UnmanagedType.LPWStr)] string extension,
    out PerceivedType perceivedType,
    out PerceivedFlags perceivedFlags,
    IntPtr ptrType
);

VB Signature:

''' <summary>
''' Retrieves a file's perceived type based on its extension.
''' </summary>
''' <exception cref="System.IO.FileNotFoundException">Unknown files extension</exception>
<DllImport("Shlwapi.dll", ExactSpelling := True, PreserveSig := False)> _
Shared Sub AssocGetPerceivedType( _
    <MarshalAs(UnmanagedType.LPWStr)> extension As String, _
    <Out> ByRef perceivedType As PerceivedType, _
    <Out> ByRef perceivedFlags As PerceivedFlags, _
    ptrType As IntPtr _
)
End Sub

User-Defined Types:

See Perceived and PerceivedFlag enumerations

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

C# example

PerceivedType type;
PerceivedFlag flags;
AssocGetPerceivedType(".wav", out type, out flags, IntPtr.Zero);

VB.NET example

Dim type As PerceivedType
Dim flags As PerceivedFlags
AssocGetPerceivedType(".wav", type, flags, IntPtr.Zero)