[DllImport("shlwapi.dll", EntryPoint = "PathRemoveBackslashW",  SetLastError = True, CharSet = CharSet.Unicode)]

static extern IntPtr PathRemoveBackslash([MarshalAs(UnmanagedType.LPTStr)]System.Text.StringBuilder lpszPath);

<DllImport("shlwapi.dll", EntryPoint:="PathRemoveBackslashW",  SetLastError:=True, CharSet:=CharSet.Unicode)> _

Public Function PathRemoveBackslash(<MarshalAs(UnmanagedType.LPTStr)>lpszPath As System.Text.StringBuilder) As IntPtr

Public Declare Function PathRemoveBackslash Lib "shlwapi" Alias "PathRemoveBackslashA" _