Transparent Images?

I am writing a small Asp.net App for my friends because it seems they find network based file access "too complicated". meh....

Anyway, i figured it would be a nice touch to display the default system icons for the file type.

(i know if i really wanted to make this simple i could create a virtual directory and enable directory browsing in IIS, but im subborn)

This class i put together works fine but the image background isnt transparent, its black. This doesnt look to great on the page unless its black, and its not ;(

what am i missing?

VB Code:

Public Enum IconSize
        Large
        Small
    End Enum
 
    Public Class FileSytemIcon
 
#Region " API "
        Private Structure SHFILEINFO
            Public hIcon As IntPtr            ' : icon
            Public iIcon As Integer           ' : icondex
            Public dwAttributes As Integer    ' : SFGAO_ flags
            <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=260)> _
            Public szDisplayName As String
            <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=80)> _
            Public szTypeName As String
        End Structure
 
        Private Declare Auto Function SHGetFileInfo Lib "shell32.dll" _
                (ByVal pszPath As String, _
                 ByVal dwFileAttributes As Integer, _
                 ByRef psfi As SHFILEINFO, _
                 ByVal cbFileInfo As Integer, _
                 ByVal uFlags As Integer) As IntPtr
 
        Private Const SHGFI_ICON = &H100
        Private Const SHGFI_SMALLICON = &H1
        Private Const SHGFI_LARGEICON = &H0    ' Large icon
 
#End Region
 
#Region " Properties and Member Variables "
        Private m_iSmall As Icon
        Private m_iLarge As Icon
 
        Public ReadOnly Property SmallIcon() As Icon
            Get
                Return m_iSmall
            End Get
        End Property
 
        Public ReadOnly Property LargeIcon() As Icon
            Get
                Return m_iLarge
            End Get
        End Property
 
#End Region
 
#Region " Private Methods "
 
        Private Sub RetriveIcons(ByVal strExtension As String)
            Dim hImgSmall As IntPtr
            Dim hImgLarge As IntPtr
 
            Dim shinfo As New SHFILEINFO
 
 
            shinfo.szDisplayName = New String(Chr(0), 260)
            shinfo.szTypeName = New String(Chr(0), 80)
 
 
            'SmallIcon
            hImgSmall = SHGetFileInfo(strExtension, 0, shinfo, _
                        Marshal.SizeOf(shinfo), _
                        SHGFI_ICON Or SHGFI_SMALLICON)
 
            m_iSmall = System.Drawing.Icon.FromHandle(shinfo.hIcon)
 
            'LargeIcon
            hImgLarge = SHGetFileInfo(strExtension, 0, shinfo, _
                        Marshal.SizeOf(shinfo), _
                        SHGFI_ICON Or SHGFI_LARGEICON)
 
            m_iLarge = System.Drawing.Icon.FromHandle(shinfo.hIcon)
 
        End Sub
#End Region
 
 
        Public Sub New(ByVal Extension As String)
            RetriveIcons(Extension)
        End Sub
 
    End Class

Sample in jpg attached (icon for .ini)