Windows 11 won't let me open Dropbox documents that are on my hard drive (0x80070780 error)

There must be some sort of permission or third party issue on the OS profile you're working on at the moment dplam 

Can you try creating a new OS profile and installing the desktop app there? 

Let me know if you still get the same error. 

for anyone having problems with windows 11 make sure you right click the Dropbox icon within windows explorer and choose "Make available offline" 

Thanks but when I right click on the Dropbox icon in windows explorer, I don't get that option.  The pop out menu does not show a Dropbox icon.

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dplam wrote:

Thanks but when I right click on the Dropbox icon in windows explorer, I don't get that option.  The pop out menu does not show a Dropbox icon.

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Have you checked Drobox is running on your machine? May be worth a redownload and install: www.dropbox.com/downloading 

Hi, I'm receiving the same exact error on  Win 10 PC. My use case is another user had DropBox, and had >90 GB of files in their C:\users\dropbox   folder. File thumbnails show up with an X in the lower left hand corner. I have reset NTFS permissions to everyone\full control, disabled inheritance, applied to sub-folders. I uninstalled and reinstalled DropBox desktop App, still no access. I'm an IT Pro with a decade plus of experience, so can provide additional technical details if necessary.

Hi schnugee, is this a grey X you're seeing as the sync icon? Do you have OneDrive currently installed and running on your machine?

Thank you for the response Jay. I see no indications from the Registry that OneDrive was enabled, or used by this user.

Are the files marked as available offline, or online-only?

Unfortunately, I don't have the previous user's credentials to log into their profile, or DropBox account. I am the local administrator of the machine, and have full NTFS permissions to the directory.

Without being able to access the profile, it wouldn't be possible to troubleshoot any further, since we need to know if the Dropbox desktop application was syncing normally, or if there any other steps we could try from there.