vb6 call dll api in other folder

Code:

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Private Declare Function Add Lib "AComDll_Thread" (ByVal A As Long, ByVal B As Long) As Long

Private Sub Form_Load()
    Dim DllPath As String, NowPath As String
    DllPath = App.Path & "\dll"
    DllPath = "Z:\test"
    NowPath = App.Path
    ChDrive Left$(DllPath, 2)
    ChDir DllPath
    '-----------------------
    MsgBox Add(3, 4)
    '-----------------------
    ChDrive Left$(NowPath, 2)
    ChDir NowPath
   
    MsgBox App.Path
End Sub

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Code:

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Private Declare Function Add Lib "AComDll_Thread" (ByVal A As Long, ByVal B As Long) As Long
Private Declare Function SetCurrentDirectoryW Lib "kernel32" (ByVal lpPathName As Long) As Long

Private Sub Form_Load()
    Dim DllPath As String, NowPath As String
    DllPath = App.Path & "\dll"
    SetCurrentDirectoryW StrPtr(DllPath)
   
    MsgBox Add(3, 4)
    MsgBox App.Path
End Sub

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https://learn.microsoft.com/en-us/wi...tdlldirectoryw