MS Access VBA Error: Run time error '70' Permission Denied

In Access, we can suffice with this very short function to generate a GUID by leveraging Application.StringFromGUID to cast bytes to a GUID. It generates pretty verbose GUIDs, though, with the format {guid {00000000-0000-0000-0000-000000000000}}.

Declare PtrSafe Sub CoCreateGuid Lib "ole32" (ByVal GUID As LongPtr)
Public Function NewGUID() As String
    Dim b(15) As Byte
    CoCreateGUID VarPtr(b(0))
    NewGUID = Application.StringFromGUID(b)
End Function

You can strip away unwanted characters, for example by replacing the last line of this function with NewGUID = Mid(Application.StringFromGUID(b), 8, 36). Then, the format will be 00000000-0000-0000-0000-000000000000

From Microsoft:

This issue is by design, as of the July security updates. This control is blocked as a security measure to help prevent malicious code from running in Office applications. We are working on getting a knowledgebase article out with the recommended method. Until that KB is ready, I'll post the content here:

Workaround The preferred method is to change the code to use Windows API CoCreateGuid (https://msdn.microsoft.com/en-us/library/windows/desktop/ms688568(v=vs.85).aspx) instead of CreateObject("Scriptlet.TypeLib").Guid

' No VT_GUID available so must declare type GUID
Private Type GUID_TYPE
    Data1 As Long
    Data2 As Integer
    Data3 As Integer
    Data4(7) As Byte
End Type
Private Declare PtrSafe Function CoCreateGuid Lib "ole32.dll" (Guid As GUID_TYPE) As LongPtr
Private Declare PtrSafe Function StringFromGUID2 Lib "ole32.dll" (Guid As GUID_TYPE, ByVal lpStrGuid As LongPtr, ByVal cbMax As Long) As LongPtr
Function CreateGuidString()
    Dim guid As GUID_TYPE
    Dim strGuid As String
    Dim retValue As LongPtr
    Const guidLength As Long = 39 'registry GUID format with null terminator {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}

    retValue = CoCreateGuid(guid)
    If retValue = 0 Then
        strGuid = String$(guidLength, vbNullChar)
        retValue = StringFromGUID2(guid, StrPtr(strGuid), guidLength)
        If retValue = guidLength Then
            ' valid GUID as a string
            CreateGuidString = strGuid
        End If
    End if
End Function

Alternate Workaround

This will allow you to use CreateObject("Scriptlet.TypeLib")however it will lessen the security protection added by the Office July 2017 security update. You can set a registry key that will allow Scriptlet.TypeLib to instantiate inside of Office applications. When this registry key is set, Office will not block any use of this COM control.

• Open Registry Editor.
• Go to: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\16.0\Common\COM Compatibility{06290BD5-48AA-11D2-8432-006008C3FBFC}
  • Note: you may need to search the registry to find the correct location under HKEY_LOCAL_MACHINE based on your installed Office version.
• Add ActivationFilterOverride
• Set DWORD: 1

Detailed Instructions:

1. Click Start, click Run, type regedit in the Open box, and then click OK. Locate and then click the following key in the registry: HKEY_LOCAL_MACHINE
2. On the Edit menu, point to Find, and then enter the following in the Find What: text box: COM Compatibility
3. Ensure Keys is selected, and Values and Data are deselected. Next select Match whole string only, click Find Next Locate and then click the following key: {06290BD5-48AA-11D2-8432-006008C3FBFC} Note: if the key is not present you will need to add it. On the Edit menu, point to New, and then click Key. Type in {06290BD5-48AA-11D2-8432-006008C3FBFC}
4. On the Edit menu, point to New, and then click DWORD (32-bit) Value
5. Type ActivationFilterOverride for the name of the DWORD, and then press Enter.
6. Right-click ActivationFilterOverride, and then click Modify.
7. In the Value data box, type 1 to enable the registry entry, and then click OK.
8. Note to disable the ActivationFilterOverride setting, type 0 (zero), and then click OK.
9. Exit Registry Editor, and then restart any open Office application.