Shell Problems Shell Menus ShellExView Utility NirSoft Utilities
AcShellExtension.dll - Explorer crashes everytime when trying to copy and paste

From 20th June 2016 i started having issues when trying to copy and paste within Explorer, after spending days searching the web for info i finally posted a question on Microsoft Community and spent more days having emails back-n-forth trying to sort the issue until i was advised to try ShellExView and disable all non-Microsoft extensions. Once done i was then to enable each item one by one until i found the cuplrit. This sounded 'All too easy' but i ended up having to try this 3 times (wasn't aware that the explorer needed to restart after each item) there didn't seem a logic to how it was occuring, eventually i restarted the explorer after each item was enabled it was only then that i could locate and diagnose 'MyWinLocker - DragDropProtect Class' as being the underlying problem. What i will also add to the conclusion 'i believe' that this only occured after failed attempts of Windows 10 being installed, this to-date has failed 4 times, and you'd think now it would give up!!

The details of the shell extension that might cause the problem:

Shell Extension Name: AcColumnHandler
Filename: AcShellExtension.dll
Description: AutoCAD Dwg common shell extension handler
Company: Autodesk
Product Name: AutoCAD
File Version:
CLSID: {8A0BC933-7552-42E2-A228-3BE055777227}

If you think that you have similar problem in your system, you can try to fix the problem by disabling the specified shell extension. In order to do that, simply follow the instructions below:

  1. Download and run the ShellExView utility from this Web page.
  2. Find the right shell extension according the details specified above.
  3. Select this shell extension and press F7 to disable this extension. After disabling the shell extension, check if the problem still occurs. If the problem still occurs, you should enable back the shell extension by pressing F8, and then try to search for another shell extension that might cause your problem.

This shell extension problem was reported by Wilso13