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Issue:

When you observed either one of the error as below due to Thumbs.db file extension:

  1. file extension not valid error: error thumbs  {com.ephesoft.dmca.monitor.service.foldermoniterserviceimpll] file extension not valid
  2. Exception while deleting folder at path: <Drop Folder Path>     

Cause:

Hidden files (Thumbs.DB) in drop folders.

There are 2 solutions to disabled the Thumbs.db as following:

A. Disable Thumbs.db from Local Group Policy Editor:

  1. Ensure you’re logged in using an administrator account.
  2. Hit Win+R, type gpedit.msc in the Run window and click OK. The Local Group Policy Editor will be launched.
  3. Navigate through the tree to User Configuration > Administrative Templates > Windows Components > then either Windows Explorer (Windows Vista/7) or File Explorer (Windows 8).001
  4. In the right-hand pane, double-click “Turn off the caching of thumbnails in hidden thumbs.db files”.
  5. Select Enabled (don’t make my mistake of choosing “Disabled” — you’re enabling the switching off of Thumbs.db. Not particularly intuitive, Microsoft!)002

 

B. Disable Thumbs.db from Folder Options:

For Windows 7/8

1. Open a File explorer > select Organize > follow by Folder and search options.

            

2. From Folder Options > select View tab.

3. Go to Advanced settings column, check the “Always show icons, never thumbnails” option

4. Lastly, click OK button to save the setting.

               

 

For Windows 10

1. Open a File explorer > select View tab > select the Options > next step is select the Change folder and search options.

2. From Folder Options > select View tab.

3. Go to Advanced settings column, check the “Always show icons, never thumbnails” option.

4. Lastly, click OK button to save the setting.

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Walter Lee