ChanandlerBong - 1:09 am on Sep 24, 2012 (gmt 0)
problem solved. Removed BOM from all my pages and they now open locally as html.
Still confused how modern browsers should trip over this, especially as I've read elsewhere "most modern browsers will not have problems with the existence of a BOM at the start of a file".
Anyway, thanks for help and tips from everyone.