Team Foundation Server 2010 Not Honoring My .tfignore file

Question

Here's my .tfignore exactly. It is in the root directory of the branch and committed to TFS, but it is never honored. I imagine I'm missing some syntactic subtlety not clear to me from reading TechNet's article on the .tfignore file, but what?

### Team Foundation Server Source Control Ruleset Overrides for the Web Project
### These are created to ensure the proper files for the BEC Website end up
### under control.

## INCLUSIONS
# It is truly silly that VS excludes "Debug"...
!debug

# Include any binaries from sources, because they're all third party...
\sources\*.exe

## EXCLUSIONS
# Exclude site-specific tmp, cache and log folders...
wwwroot\administrator\cache
wwwroot\administrator\log
wwwroot\cache
wwwroot\log
wwwroot\tmp

Answer 1

You're probably not missing any syntactic subtleties, .tfignore is a new feature in VS2012 and seems to also require TFS2012.