in Windows 8 Source Preview Handler does not highlight syntax

Dear Community,
After installation of smartftp along with source preview handler there is no syntax highlighting. The addon is downloaded from here:
At the same time syntax highlighting works in smartftp editor.
OS: Windows 8 x64.
Is it something idiosyncratic, or this is a general issue? 
Syntax highlighing preview works in Windows 7 (x64).
And additional question: is there a way to add a support for additional languages? In particular, it would be nice to have syntax highlighting for Stata *.do and *.ado files.

I would definitely like to. Where can I read about it?