* This is a leftover from before the interface was hoisted out, and most
windows were still calling directly to CaptureContext instead of via
the public ICaptureContext interface
In most of these cases, the open file dialog won't even display a file
without the proper extension, so this helps ensure the user doesn't
accidentally misplace their files. The one exception is *.rdc, which
could be found without the extension, but could not be opened.
* This means that each time you open the dialog you don't start with an
empty set, instead you start with the set of counters you had
previously selected.
baldurk