I've been rooting around in the LaTeXTools package (wanting to implement TeXCount.pl), and discovered that, on Windows, when a non-.tex file is in the open view, the View PDF and Jump to PDF commands fail to warn the user as expected. Instead, the following is printed to the console:

Traceback (most recent call last):
File ".\sublime_plugin.py", line 339, in run_
File ".\viewPDF.py", line 15, in run
AttributeError: 'View' object has no attribute 'fileName'

Sadly my lack of knowledge of Windows (usually on *nix!) and Python (usually in Perl!) make me unable to work out what's going on.