What is Interop.IWshRuntimeLibrary.dll?

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Developed by Sage Software, Interop.IWshRuntimeLibrary.dll is a shared dynamic link library file. It belongs to the contact management software Act! 2009, which allows users to bring together different types of information.

As a shared file, Interop.IWshRuntimeLibrary.dll is also called upon by other applications, including RegServe, Advanced System Protector, SDL MultiTerm, and Activeris AntiMalware.

Because this file does not directly exist within a program, it is known to cause various error messages, such as:

  • Interop.IWshRuntimeLibrary.dll is missing
  • Interop.IWshRuntimeLibrary.dll not found
  • Cannot register Interop.IWshRuntimeLibrary.dll
  • This application failed to start because Interop.IWshRuntimeLibrary.dll was not found. Re-installing the application may fix this problem
  • Cannot find Interop.IWshRuntimeLibrary.dll
  • Required DLL Interop.IWshRuntimeLibrary.dll not found
  • The application or Interop.IWshRuntimeLibrary.dll is not a valid Windows image.

More often than not, these error messages appear due to a corrupted or missing Interop.IWshRuntimeLibrary.dll file. However, there are also times when they pop up because of malware entities.

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Is Interop.IWshRuntimeLibrary.dll Safe?

With all the possible problems that the Interop.IWshRuntimeLibrary.dll may trigger, you may have probably asked yourself if this file is safe. You may have even thought that Interop.IWshRuntimeLibrary.dll is a virus.

Well, here’s what you should know. A legitimate Interop.IWshRuntimeLibrary.dll should not damage your computer. In fact, it can help some important system processes to run smoothly.

Now, it is worth noting that there are many cybercriminals out there who may be waiting patiently and watching your every move, trying to find any possible loophole or vulnerability they can exploit. What’s even more alarming is that these bad guys have already disguised malware entities, giving them names of legitimate DLL files such as Interop.IWshRuntimeLibrary.dll. In this case, you need to take action.

You may ask, “Can I Remove Interop.IWshRuntimeLibrary.dll? I suspect that it’s a malicious entity that will only cause problems on my PC.” Our answer is no. We advise you to just leave it alone. The reason is that many programs share this file. If you delete it, it can unintentionally disrupt processes and cause problems.

If error messages are persistent and keep on showing, just follow the fixes below:

How to Fix Interop.IWshRuntimeLibrary.dll Errors

Here are some fixes that we recommend if you ever encounter any Interop.IWshRuntimeLibrary.dll-related errors:

Fix #1: Run SFC

The safest and easiest way to repair a problematic Interop.IWshRuntimeLibrary.dll file is to run the built-in SFC utility of your Windows device.

Here’s how to use it:

  1. Right-click on the Start menu.
  2. Select Command Prompt (Admin).
  3. Into the command line, input the sfc /scannow The scan process may take up to 10 minutes. But once it’s completed, you can restart your PC.

Fix #2: Update outdated device drivers

Sometimes, you get an Interop.IWshRuntimeLibrary.dll error while using an external peripheral device like a printer. In this case, the error could be caused by an outdated driver version that is no longer compatible with the new Interop.IWshRuntimeLibrary.dll file. So, try to update your device’s drivers and check if it fixes the problem.

Because finding a device driver that is compatible with your PC’s version is not easy, it is best that you use a third-party driver updater tool to automate the update process.

Fix #3: Reinstall Interop.IWshRuntimeLibrary.dll

Installing the Interop.IWshRuntimeLibrary.dll file is quite simple. All you need to do is copy the original DLL file into C:\Windows\System32. And then, input this command: regsvr32 Interop.IWshRuntimeLibrary.dll. Finally, hit Enter. The new DLL file should now be installed.

There are some online guides that suggest downloading the DLL file from the web. We highly discourage doing so because you can never be so sure where these files came from. They might be bundled with malware components that once installed, will cause your PC to no longer function properly.

If you insist on downloading a new DLL file, make sure you have an anti-malware tool installed on your PC. This way, you will be quickly notified if ever a suspicious entity has infiltrated your device.

Although optional, you may also install a PC repair tool. It will keep your PC running smooth and efficiently as you mitigate the problem.


Because the Interop.IWshRuntimeLibrary.dll file is shared by many applications or programs, it is best that you just leave it as is. But if it is causing problems on your PC, then pull up this article and try any of the solutions above.

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