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Documentation

[FindMimeFromData] on MSDN

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    static extern int FindMimeFromData(IntPtr pBC,

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    Private Shared Function FindMimeFromData( _

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    Public Declare Function FindMimeFromData Lib "urlmon.dll" ( _

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   int ret = FindMimeFromData(IntPtr.Zero, null, dataBytes, dataBytes.Length, mimeProposed, 0, out outPtr, 0);

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        int result = FindMimeFromData(IntPtr.Zero, file, buf, MaxContent, null, 0, out mimeout, 0);

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    Dim result As Integer = FindMimeFromData(IntPtr.Zero, file, buf, MaxContent, Nothing, 0, mimeout, 0)

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  result = FindMimeFromData(0, "file://c:/test/form1.frm", vbNullString, 0, vbNullString, 0, buffAddr, 0)