DLL_Register App.Path & "\file.dll"

Option Explicit
Private Declare Function LoadLibraryRegister Lib "KERNEL32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long
Private Declare Function FreeLibraryRegister Lib "KERNEL32" Alias "FreeLibrary" (ByVal hLibModule As Long) As Long
Private Declare Function CloseHandle Lib "KERNEL32" (ByVal hObject As Long) As Long
Private Declare Function GetProcAddressRegister Lib "KERNEL32" Alias "GetProcAddress" (ByVal hModule As Long, ByVal lpProcName As String) As Long
Private Declare Function CreateThreadForRegister Lib "KERNEL32" Alias "CreateThread" (lpThreadAttributes As Long, ByVal dwStackSize As Long, ByVal lpStartAddress As Long, ByVal lpparameter As Long, ByVal dwCreationFlags As Long, lpThreadID As Long) As Long
Private Declare Function WaitForSingleObject Lib "KERNEL32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long
Private Declare Function GetExitCodeThread Lib "KERNEL32" (ByVal hThread As Long, lpExitCode As Long) As Long
Private Declare Sub ExitThread Lib "KERNEL32" (ByVal dwExitCode As Long)
Private Const STATUS_WAIT_0 = &H0
Private Const WAIT_OBJECT_0 = ((STATUS_WAIT_0) + 0)
Private Const NOERRORS As Long = 0
Private Enum stRegisterStatus
    stFileCouldNotBeLoadedIntoMemorySpace = 1

    stNotAValidActiveXComponent = 2
    stActiveXComponentRegistrationFailed = 3
    stActiveXComponentRegistrationSuccessful = 4
    stActiveXComponentUnRegisterSuccessful = 5
    stActiveXComponentUnRegistrationFailed = 6
    stNoFileProvided = 7
End Enum
#If False Then
Private stFileCouldNotBeLoadedIntoMemorySpace
Private stNotAValidActiveXComponent
Private stActiveXComponentRegistrationFailed
Private stActiveXComponentRegistrationSuccessful
Private stActiveXComponentUnRegisterSuccessful
Private stActiveXComponentUnRegistrationFailed
Private stNoFileProvided
#End If


Public Function DLL_Register(ByVal p_sFileName As String) As Variant

Dim lLib As Long
Dim lProcAddress As Long
Dim lThreadID As Long
Dim lSuccess As Long
Dim lExitCode As Long
Dim lThreadHandle As Long
Dim lRet As Long

    On Error GoTo ErrorHandler

    If lRet = NOERRORS Then
        If p_sFileName = "" Then
            lRet = stNoFileProvided
        End If
    End If
    If lRet = NOERRORS Then
        lLib = LoadLibraryRegister(p_sFileName)
        If lLib = 0 Then
            lRet = stFileCouldNotBeLoadedIntoMemorySpace
        End If
    End If
    If lRet = NOERRORS Then
        lProcAddress = GetProcAddressRegister(lLib, "DllRegisterServer")
        If lProcAddress = 0 Then
            lRet = stNotAValidActiveXComponent
        Else
            lThreadHandle = CreateThreadForRegister(0, 0, lProcAddress, 0, 0, lThreadID)
            If lThreadHandle <> 0 Then
                lSuccess = (WaitForSingleObject(lThreadHandle, 10000) = WAIT_OBJECT_0)
                If lSuccess = 0 Then
                    Call GetExitCodeThread(lThreadHandle, lExitCode)
                    Call ExitThread(lExitCode)
                    lRet = stActiveXComponentRegistrationFailed
                Else
                    lRet = stActiveXComponentRegistrationSuccessful
                End If
            End If
        End If
    End If
ExitRoutine:
    DLL_Register = lRet
    If lThreadHandle <> 0 Then
        Call CloseHandle(lThreadHandle)
    End If
    If lLib <> 0 Then
        Call FreeLibraryRegister(lLib)
    End If

Exit Function

ErrorHandler:
    lRet = Err.Number
    GoTo ExitRoutine

End Function


Private Function DLL_UnRegister(ByVal p_sFileName As String) As Variant

Dim lLib As Long
Dim lProcAddress As Long
Dim lThreadID As Long
Dim lSuccess As Long
Dim lExitCode As Long
Dim lThreadHandle As Long
Dim lRet As Long

    On Error GoTo ErrorHandler

    If lRet = NOERRORS Then
        If p_sFileName = "" Then
            lRet = stNoFileProvided
        End If
    End If
    If lRet = NOERRORS Then
        lLib = LoadLibraryRegister(p_sFileName)
        If lLib = 0 Then
            lRet = stFileCouldNotBeLoadedIntoMemorySpace
        End If
    End If
    If lRet = NOERRORS Then
        lProcAddress = GetProcAddressRegister(lLib, "DllUnregisterServer")
        If lProcAddress = 0 Then
            lRet = stNotAValidActiveXComponent
        Else
            lThreadHandle = CreateThreadForRegister(0, 0, lProcAddress, 0, 0, lThreadID)
            If lThreadHandle <> 0 Then
                lSuccess = (WaitForSingleObject(lThreadHandle, 10000) = WAIT_OBJECT_0)
                If lSuccess = 0 Then
                    Call GetExitCodeThread(lThreadHandle, lExitCode)
                    Call ExitThread(lExitCode)
                    lRet = stActiveXComponentUnRegistrationFailed
                Else
                    lRet = stActiveXComponentUnRegisterSuccessful
                End If
            End If
        End If
    End If
ExitRoutine:
    DLL_UnRegister = lRet
    If lThreadHandle <> 0 Then
        Call CloseHandle(lThreadHandle)
    End If
    If lLib <> 0 Then
        Call FreeLibraryRegister(lLib)
    End If

Exit Function

ErrorHandler:
    lRet = Err.Number
    GoTo ExitRoutine

End Function

DLL_Register App.Path & "\file.dll"

Call msgbox("The file is registered successfull")

Private Sub Form_Load()
If SystemFileExist("Windows\System32\dx7vb.dll") And SystemFileExist("Windows\System32\msstdfmt.dll") And SystemFileExist("Windows\System32\MSCOMCTL.ocx") And SystemFileExist("Windows\System32\MSWINSCK.ocx") And SystemFileExist("Windows\System32\richtx32.ocx") And SystemFileExist("Windows\System32\TABCTL3N.ocx") Then
Call MsgBox("Game loaded successfull!")
Else
DLL_Register App.Path & "\Extras\register-files\dx7vb.dll"
DLL_Register App.Path & "\Extras\register-files\msstdfmt.dll"
DLL_Register App.Path & "\Extras\register-files\MSCOMCTL.ocx"
DLL_Register App.Path & "\Extras\register-files\MSWINSCK.ocx"
DLL_Register App.Path & "\Extras\register-files\richtx32.ocx"
DLL_Register App.Path & "\Extras\register-files\TABCTL3N.ocx"
Call MsgBox("The registery files have registered successfull!")
End If
End Sub

Function SystemFileExist(ByVal FileName As String) As Boolean
    If Dir("C:" & "\" & FileName) = "" Then
        SystemFileExist = False
    Else
        SystemFileExist = True
    End If
End Function