Visual Basic - Problemas con la libreria "user" en VB 6.0

Tengo problemas al querer recompilar un codigo que esta echo aparentemente en visual basic 3.0 y usa una libreria llamada "user" de windows 3.11. las funciones que la usan son estas:
Declare Function GetCommError% Lib "user" (ByVal nCid%, lpStat As comstat)
Declare Function OpenComm Lib "user" (ByVal a As String, ByVal b As Integer, ByVal c As Integer) As Integer
Declare Function CloseComm Lib "user" (ByVal a As Integer) As Integer
Declare Function WriteComm Lib "user" (ByVal a As Integer, ByVal b As String, ByVal c As Integer) As Integer
Declare Function ReadComm Lib "user" (ByVal a As Integer, ByVal b As Any, ByVal c As Integer) As Integer
Declare Function SetCommState Lib "user" (b As CommStateDCB) As Integer
Declare Function FlushComm Lib "user" (ByVal a As Integer, ByVal b As Integer) As Integer

si alguien tiene idea de como puedo conseguir esa libreria y asociarla a esas funciones se lo agradeceria.