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static extern int StrCmpLogicalW(string x, string y);

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Declare Unicode Function StrCmpLogicalW Lib "shlwapi.dll" (ByVal s1 As String, ByVal s2 As String) As Int32

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      public static extern int StrCmpLogicalW(string x, string y);

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     return StrCmpLogicalW(x, y);

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  Private Declare Unicode Function StrCmpLogicalW Lib "shlwapi" _

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    Return StrCmpLogicalW(x, y)

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Documentation

[StrCmpLogicalW] on MSDN