C# Signature:

[DllImport("ntdll.dll", SetLastError=true)] static extern IntPtr NtQueryInformationFile(IntPtr fileHandle, ref IO_STATUS_BLOCK IoStatusBlock, IntPtr pInfoBlock, uint length, FILE_INFORMATION_CLASS fileInformation);

VB Signature:

     Declare Function NtQueryInformationFile Lib "ntdll.dll" (ByVal fileHandle As IntPtr, ByRef IoStatusBlock As IO_STATUS_BLOCK, ByVal pInfoBlock As IntPtr, ByVal length As UInteger, ByVal fileInformation As FILE_INFORMATION_CLASS) As IntPtr

VB User-Defined Types:

    Structure IO_STATUS_BLOCK
        Dim status As UInteger
        Dim information As ULong
    End Structure

    Enum FILE_INFORMATION_CLASS
        FileDirectoryInformation = 1
        FileFullDirectoryInformation
        FileBothDirectoryInformation
        FileBasicInformation
        FileStandardInformation
        FileInternalInformation
        FileEaInformation
        FileAccessInformation
        FileNameInformation
        FileRenameInformation
        FileLinkInformation
        FileNamesInformation
        FileDispositionInformation
        FilePositionInformation
        FileFullEaInformation
        FileModeInformation = 16
        FileAlignmentInformation
        FileAllInformation
        FileAllocationInformation
        FileEndOfFileInformation
        FileAlternateNameInformation
        FileStreamInformation
        FilePipeInformation
        FilePipeLocalInformation
        FilePipeRemoteInformation
        FileMailslotQueryInformation
        FileMailslotSetInformation
        FileCompressionInformation
        FileObjectIdInformation
        FileCompletionInformation
        FileMoveClusterInformation
        FileQuotaInformation
        FileReparsePointInformation
        FileNetworkOpenInformation
        FileAttributeTagInformation
        FileTrackingInformation
        FileIdBothDirectoryInformation
        FileIdFullDirectoryInformation
        FileValidDataLengthInformation
        FileShortNameInformation
        FileHardLinkInformation = 46
    End Enum

C# User-Defined Types:

    struct IO_STATUS_BLOCK
    {
        uint status;
        ulong information;
    }

    enum FILE_INFORMATION_CLASS
    {
        FileDirectoryInformation = 1,     // 1
        FileFullDirectoryInformation,     // 2
        FileBothDirectoryInformation,     // 3
        FileBasicInformation,         // 4
        FileStandardInformation,      // 5
        FileInternalInformation,      // 6
        FileEaInformation,        // 7
        FileAccessInformation,        // 8
        FileNameInformation,          // 9
        FileRenameInformation,        // 10
        FileLinkInformation,          // 11
        FileNamesInformation,         // 12
        FileDispositionInformation,       // 13
        FilePositionInformation,      // 14
        FileFullEaInformation,        // 15
        FileModeInformation = 16,     // 16
        FileAlignmentInformation,     // 17
        FileAllInformation,           // 18
        FileAllocationInformation,    // 19
        FileEndOfFileInformation,     // 20
        FileAlternateNameInformation,     // 21
        FileStreamInformation,        // 22
        FilePipeInformation,          // 23
        FilePipeLocalInformation,     // 24
        FilePipeRemoteInformation,    // 25
        FileMailslotQueryInformation,     // 26
        FileMailslotSetInformation,       // 27
        FileCompressionInformation,       // 28
        FileObjectIdInformation,      // 29
        FileCompletionInformation,    // 30
        FileMoveClusterInformation,       // 31
        FileQuotaInformation,         // 32
        FileReparsePointInformation,      // 33
        FileNetworkOpenInformation,       // 34
        FileAttributeTagInformation,      // 35
        FileTrackingInformation,      // 36
        FileIdBothDirectoryInformation,   // 37
        FileIdFullDirectoryInformation,   // 38
        FileValidDataLengthInformation,   // 39
        FileShortNameInformation,     // 40
        FileHardLinkInformation=46    // 46    
    }

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For FILE_INFORMATION_CLASS, see: http://msdn.microsoft.com/en-us/library/cc232064.aspx

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