Currently, there is no direct method to get to a specific file/list of files found in the workspace. For example, if you have a checkout with tens of thousands of files and thousands of folders, finding a specific file is quite hard to do.

There is a sort of "search box" for the workspace, but it actually is an input which expects to receive an existing folder. If not, this pops up:
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HTTP Status 404 -

type Status report

message

description The requested resource () is not available.
Apache Tomcat/6.0.29
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BTW, isn't this a bug (yay! no input validation!) ? It should just say it didn't find the file, not throw a 404 at the user

The search method can be simple, maybe some extra options could be added if you wish, like a search language (+, -, and, or, ...).