Using Visual Studio as an HTML editor with SharePoint's Design Manager

I'm building a master page using Design Manager. I've mapped a network drive so that I can access the MasterPage.html file with an HTML editor.

I'd like to use Visual Studio 2012 as my HTML editor.  But, when I modify MasterPage.html in VS, it creates a MasterPage.html~RF9158aed.TMP file alongside the MasterPage.html and MasterPage.master files, which breaks the master page in SharePoint.

I can modify MasterPage.html successfully with NotePad.  I can also modify an html file, that is not associated with a folder in SharePoint via a networked drive, with VS.

Can I use Visual Studio as an HTML editor in this scenario?  If so, what am I doing wrong?

Your help would be much appreciated.

Thanking you in anticipation.

Roger

rogerwithnell