Sharepoint 2010 webdav json

Hi all

i having an issue with sharepoint 2010 and json files, more uploadidng them via a webdav/explorer window.   Its not in the blocked file types list technet.microsoft.com/en-us/library/cc262496(v=office.14).aspx

I am exporting files out of author-it and it connects to site to upload it works until it gets to the json then fails.  I have tried copying these manual up using explorer view and it fails, you are able to upload the files manually using sharepoint webload. 

Any help?

This worked in sharepoint 2007, but no longer works on 2010 & 2013