Every time I log onto a new site i get the following popup:Content [application/octet-stream] found Do you want to download it to C:\Users\kathy\ ? ... Can someone please tell me what this is and how do I stop this!

Question

Content [application/octet-stream] found
Do you want to download it to C:\Users\kathy\ ?
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Answer 1

Back up all data.
Check the Mail, Contacts & Calendar preference pane to make sure you're not synchronizing Notes in more than one account.
If you're not, disable Notes synchronization temporarily.
Quit Notes, if it's running.
Triple-click the line below to select it:
~/Library/Containers/com.apple.Notes
Copy the whole line of text to the Clipboard (command-C).
In the Finder, select
Go ▹ Go to Folder
from the menu bar. Paste into the box that opens (command-V), then press return. A Finder window should open with a folder selected. If it does, move the selected folder — not just its contents — to the Desktop.
The folder you're moving is named "com.apple.Notes" It is not the subfolder named "Data" or anything else.
Re-enable Notes synchronization.
Relaunch Notes and test. If it works now, delete the folder you moved. Otherwise, quit again, and put the folder back where it was, overwriting the one that may have been created in its place.
Caution: If you delete some or all of the contents of the selected folder, but leave the folder itself in place, the application may not launch. Deleting the folder will cause it to be rebuilt automatically.