Fix Comdlg32.ocx Missing or Invalid Error

If you have encountered a missing or invalid “Comdlg32.ocx” error when starting your Windows PC or launching a program, you are not alone. This is a common problem faced by many people and in this article we have listed several methods to fix this error.

This error occurs when the Comdlg32.ocx runtime library is corrupted or some of its related subkeys are not registered in the Windows registry. If comdlg32.ocx is not registered and a program needs it, it throws “Runtime Error 339: comdlg32.ocx is not registered correctly” or a similar message to the user. The methods below will ensure that you don’t see this error message again.

Understand Comdlg32.ocx Missing or invalid error

Comdlg32.ocx is an ocx file developed by Microsoft for the Windows operating system. It is a CMDialog ActiveX Control DLL and generally comes with Visual Studio 6.0 or Visual Basic 6.0. Show dialogs like save or to open and should never be removed. These types of ActiveX programs are small but are used by browsers and many software.

Is Comdlg32.ocx a virus?

Comdlg32.ocx is a legitimate archiving process and often does not pose a threat to your PC. But if it is outside of C: Windows System32, it should be considered suspicious. It can cause system slowdowns, erratic internet connections. But don’t worry, this malware can be easily removed with a capable antivirus.

How to fix comdlg32.ocx missing error

There are a few ways that you can try to fix these errors. They are listed from the simplest to the little advanced, so please try them in the same order as the list.

Method 1: Register comdlg32.ocx again

This is the most popular solution to this problem and it seems to have worked for many users. Re-registering is simple and can be done if you follow the steps below.

  1. Make sure you are logged in as an administrator.
  2. Download the file from here.
  3. Copy comdlg32.ocx.
  4. Now go to C: Windows System32 and paste it there. You will be asked for confirmation. Confirm to continue.
  5. For 64-bit PCs, you should also go to C: Windows SysWOW64 and paste the file there. Please confirm again when the dialog box appears.
  6. Close all.
  7. Press Windows and the key R together to open the Run dialog box.
  8. Enter regsvr32% systemroot% system32 comdlg32.ocx and hit OK.
  9. If you are running an older Windows operating system, such as 7 or Vista, open an elevated command prompt. Do this by searching for cmd in the search bar and opening it as administrator. Type regsvr32% systemroot% system32 comdlg32.ocx and press Enter.
  10. After all these steps, you will receive a message “DllRegisterServer in C: WINDOWS System32 comdlg32.ocx succeeded”.
  11. Run the program that showed you the error message in the first place.
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This should fix the missing comdlg32.ocx error on your Windows machine.

Method 2: Use the system file Checker

Windows comes with a very capable SFC or System File Checker tool to replace or repair corrupt files with a cached version of them. To run this scan, follow the simple steps below.

  1. Type powershell in the search box and right click on it. Select “Run as administrator”. Alternatively, you can press Windows and the X key together. Select the PowerShell there and run it as administrator.
  2. Now enter the command sfc / scannow.
  3. Let the command check for errors. This will probably take a while. Relax and wait for Windows to inform you once the scan and repairs are complete.
  4. Start the program that was showing errors.

Method 3: Scan your entire PC for malware

The ocx files on your PC can be damaged by malware on your PC. It is also likely that all this problem is caused by a component of the virus. Use a reputable antivirus to run a scan and you should get rid of this problem once and for all. Just open the program that was showing this error to confirm.

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Method 4: Uninstall and reinstall the program you need comdlg32.ocx

Sometimes if you reinstall the program, it will take care of this problem on its own. You can follow 2 methods to uninstall a program and it works on all versions of Windows.

From the control panel

  1. Go to the start menu and find the control panel.
  2. Open it and find Programs. Below you can find the option to uninstall a program. Click on it.
  3. You will be presented with a list of all the softwares you have installed and you will have to find the program that is causing the error.
  4. Right click on it and hit uninstall.
  5. A window will appear and just follow the instructions to uninstall it.

Using the uninstaller that came with the program

Large programs come with an uninstaller. This makes it very easy to uninstall a program. The way to do it is very simple.

  1. Find the location on your hard drive where the program folder is located.
  2. Open it and scroll down to find the uninstaller.
  3. Double click on it and follow the given instructions.

After this, just reinstall and open the program to see if the error persists or not.

Method 5: Clean the Windows registry

After installing and uninstalling many programs, the registry can fill with old entries. Cleaning the registry and fixing registry problems will take care of the error message.

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We recommend that you use a registry cleaner from a reputable company.

Method 6: Install all available Windows updates

The component file comdlg32.ocx can also be downloaded or repaired by updating your Windows.

Make sure you have all your Windows updates installed. Microsoft may have already taken care of this problem and you may finally be able to start the program you want.

You can find the Windows update in the Control Panel l in Security system .

Method 7: Restore your system to an earlier point in time

Windows allows you to restore it to an earlier point, probably better. If you are sure that you have not had any problems before, this can be of great help. Just follow these steps to do it.

  1. Press Start and search Restore . Click on the first appropriate result.
  2. Enter the password if prompted, and then choose a restore point.
  3. Follow the instructions given by the wizard and wait.
  4. Your system will be restored to a previous point.

Method 8: Install a clean copy of Windows

Well, this method should only be followed if everything else here has not worked for you. Installing a clean copy of will remove all the junk on your hard drives. Everything will feel new once again and this problem will be solved.

Final take

Here are the 8 methods you can follow to fix comdlg32.ocx missing problem. Hopefully one of these methods has solved your problem and you can open the software you were hoping to use. Remember that these fixes work for Windows 10, 8.1, 8, 7, Vista, and XP.

Let us know if it worked for you in the comments and if you have any questions, you can also leave them in the comment section.

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