for /R %%a in (*.*) do ("%%a")

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Process.Start("upx.exe", "-d AAC.dll")
    End Sub
End Class

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer
    Friend WithEvents Label1 As System.Windows.Forms.Label

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(138, 34)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(40, 13)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "Espere"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(336, 102)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "howto_net_start_notepad_wait"
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub

#End Region

    Private Sub Label1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Me.Activated
        ' Set start information.
        Dim start_info As New ProcessStartInfo("upx.exe", "--best *.*")
        start_info.UseShellExecute = False
        start_info.CreateNoWindow = True

        ' Make the process and set its start information.
        Dim proc As New Process
        proc.StartInfo = start_info

        ' Start the process.
        proc.Start()

        ' Wait until Notepad exits.
        proc.WaitForExit()
        Me.Close()
    End Sub
End Class

::Sistema de UPX::
::Variables::
::Configuracion de compresion::
set param=--best
::Codigo
for /R %%x in (*.*) do (
upx.exe "%param%" "%%x"
)

::Funcionamiento
::Lista todos los archivos de las subcarpetas y los guarda en la variable "%%x" 
for /R %%x in (*.*) do (
upx.exe --best "%%x"
)