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

static extern void PathUnQuoteSpaces([MarshalAs(UnmanagedType.LPTStr)]System.Text.StringBuilder lpsz);

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

Public Sub PathUnQuoteSpaces(<MarshalAs(UnmanagedType.LPTStr)>lpsz As System.Text.StringBuilder)

Public Declare Sub PathUnquoteSpaces Lib "shlwapi" Alias "PathUnquoteSpacesA" _