Understanding wildcards when specifying test assemblies for the MSTest runner in TeamCity 7

Basically I want to specify "all files that end with Test.dll", also known as

*.Test.dll

.

*.Test.dll

doesn't work, presumably because it matches only files in the current working directory.
However, I didn't have any luck with

**\*Test.dll

either. For some reason I had to use

**\bin\**\*Test.dll

for it to find any test assemblies it could run.
The TeamCity 7 documentation for MSTest doesn't say anything about  wildcards, as far as I can tell. Can someone help me understand  wildcards when specifying test assemblies for the MSTest runner in  TeamCity 7?
Is it possible to specify files matching a certain file name pattern, but in whatever directory?