Adding the file extension in a status file does not work.

pkg/pkg.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Run this test manually to verify that the fixnum library produces
 # the same results as native ints on a set of directed and random inputs.
 # Skip it when running automated tests because it times out.  This
 # test only makes sense on runtimes that support 64-bit integer
 # arithmetic natively, i.e., the VM.
 fixnum/test/int_64_vm_test: Skip
@@ skipping 50 matching lines @@
 intl/test/date_time_format_file_odd_test: Skip
 intl/test/find_default_locale_standalone_test: Skip
 intl/test/message_extraction/message_extraction_test: Skip
 analyzer_experimental/test/options_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/ast_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/element_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/parser_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/resolver_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/scanner_test: Skip # Imports dart:io.
 analyzer_experimental/test/error_test: Skip # Imports dart:io.
-analyzer_experimental/test/services/formatter_test.dart: Skip #Imports dart:io
+analyzer_experimental/test/services/formatter_test: Skip #Imports dart:io
 
 # Issue 8440 forces us to use pathos in the scheduled_test tests, which would
 # otherwise be dart2js-compatible.
 scheduled_test/test/*: Skip
 
 # We use pathos in the stack_trace tests. We can run them on dart2js when issue
 # 6943 is fixed.
 stack_trace/test/*: Skip
 
 [ $runtime == opera && $compiler == dart2js ]
@@ skipping 80 matching lines @@
 *: Skip
 
 # Skip serialization test that explicitly has no library declaration in the
 # test on Dartium, which requires all tests to have a library.
 [ $runtime == dartium || $runtime == drt ]
 serialization/test/no_library_test: Skip # Expected Failure
 
 # Skip mdv_observe tests on command line VM, they only run in the browser.
 [ $runtime == vm ]
 mdv_observe: Skip