VBA & Macro Problems

How to Fix MSCOMCTL32.OCX TreeView Errors in 64-Bit Office VBA

Adam Davis Oct 10, 2026 869 views

Question details

The user needs to fix errors that occur when inserting or using the MSCOMCTL32.OCX TreeView control in a VBA UserForm.

How to Fix MSCOMCTL32.OCX TreeView Errors in 64-Bit Office VBA

Product: Microsoft Office VBA
Device & OS: not provided
Scenario: Attempting to use legacy Visual Basic 6 TreeView controls within VBA UserForms in a 64-bit Office environment, particularly in newer PowerPoint builds.
Observed behavior: The TreeView control fails to load or triggers a compatibility error because MSCOMCTL32.OCX is a 32-bit legacy control that cannot run natively in 64-bit Office.

Before you start

Verify whether your installation of Microsoft Office is 32-bit or 64-bit, as this architectural difference is the primary cause of the control failure.

Solution 1Recommended

Install the 32-Bit Version of Microsoft Office

The most reliable way to use legacy 32-bit VB6 controls like MSCOMCTL32.OCX is to run the 32-bit version of Office.

MSCOMCTL32.OCX is a legacy 32-bit Visual Basic 6 control. Because 64-bit applications cannot load 32-bit components directly into their memory space, this control will natively fail in 64-bit Office environments. Switching to the 32-bit version of Office restores full compatibility.

Check current Office bitness

Open any Office application like PowerPoint or Excel. Navigate to File > Account > About PowerPoint. Look at the top line to see if it says 64-bit or 32-bit.

Uninstall 64-bit Office

If you are running the 64-bit version, close all Office apps. Open the Windows Control Panel, go to Programs and Features, select Microsoft Office, and click Uninstall.

Reinstall as 32-bit

Log into your Microsoft account online, download the Office installer, select 'Other install options', and explicitly choose the 32-bit version from the dropdown menu before installing.

Install the 32-Bit Version of Microsoft Office

Memory Limitations: Installing 32-bit Office limits the application to a 2GB or 4GB memory footprint, which may impact performance if you work with exceptionally large datasets or files.

Solution 2

Replace TreeView with a 64-Bit Compatible Alternative

If you must remain on 64-bit Office, you will need to replace the legacy TreeView control with a modern or alternative method.

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Frequently Asked Questions

Why does MSCOMCTL32.OCX work in VB6 but not in Office 64-bit?

Visual Basic 6 is inherently a 32-bit environment, which seamlessly supports the 32-bit MSCOMCTL32.OCX file. Office 64-bit runs in a 64-bit memory space and cannot natively load 32-bit ActiveX controls, causing it to throw errors when attempting to render them.

Can I register MSCOMCTL32.OCX on a 64-bit Windows system?

Yes, you can register it on 64-bit Windows using the 32-bit version of regsvr32 (located in C:\Windows\SysWOW64). However, doing this only makes the control available for 32-bit applications (like 32-bit Office), not 64-bit applications.

Is there an official 64-bit version of MSCOMCTL32.OCX available?

No, Microsoft has never released a 64-bit version of the Windows Common Controls (MSCOMCTL32.OCX). If you require 64-bit compatibility, you must use native VBA controls or find a third-party 64-bit component.

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