'[先引用Registry Access Functions library(RegObj.dll)]:

Function GetWINRARPath() As String
    Dim myReg As New Registry, KeyFound As Boolean
    
    KeyFound = myReg.GetKeyValue(HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\WinRAR.exe", "Path", GetWINRARPath)
    
    If KeyFound = False Then
        'WINRAR.EXE 可以单独运行，所以可以拷贝到项目目录下使用
        GetWINRARPath = "WinRAR"
    End If
    If KeyFound = True Then
        GetWINRARPath = GetWINRARPath & "/WinRAR"
    End If
End Function

Sub compress(ByVal SOURCE As String, ByVal TARGET As String)
    Dim WINRARPath As String
    WINRARPath = GetWINRARPath
    If Dir(SOURCE) > "" Then
        On Error Resume Next
        Shell WINRARPath & " a -r " & TARGET & " " & SOURCE, vbHide
        If Err <> 0 Then
            MsgBox "系统未安装WINRAR.EXE!"
        End If
    End If
End Sub

Sub decompress(ByVal SOURCE As String, ByVal TARGET As String)
    Dim WINRARPath As String
    WINRARPath = GetWINRARPath
    If Dir(SOURCE) > "" Then
        On Error Resume Next
        Shell WINRARPath & " x -r " & SOURCE & " " & TARGET, vbHide
        If Err <> 0 Then
            MsgBox "系统未安装WINRAR.EXE!"
        End If
    End If
End Sub


Private Sub Command1_Click()
    '压缩Lock文件夹
    compress "Lock/", "Lock.rar"
End Sub

Private Sub Command2_Click()
    '解压到a文件夹
    decompress "Lock.rar", "a/"
End Sub

使用前导入注册表的引用Registry Access Functions

参考资料：

• VB 利用WINRAR 压缩文件及解压
• WinRAR的命令行模式用法介绍