"Blocked file not migrated to SharePoint" error (86796)

The following error occurred during migration: "Blocked file not migrated to SharePoint"

By default a SharePoint blocks certain file types from being uploaded by users.

You can check what file types are blocked in Central Administration - Security - Define blocked file types (SharePoint 2010)

Refer to the following article for more details:

http://technet.microsoft.com/en-us/library/cc262496.aspx

RESOLUTION 1:

Delete the blocked file extensions from the list of blocked files.
 

RESOLUTION 2:

Verify that the global settings are not conflicting with any size limits changes in the SharePoint UI. From the tools - options menu go to the SharePoint tab and click on "blocked files". From here replace the default 50 in the top box with a higher number or set it to 0 to completely ensure there is no restriction.