Index: libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cerr.sh.cpp
===================================================================
--- libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cerr.sh.cpp
+++ libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cerr.sh.cpp
@@ -10,8 +10,6 @@
 
 // istream cerr;
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 // UNSUPPORTED: executor-has-no-bash
 // FILE_DEPENDENCIES: ../check-stderr.sh
 // RUN: %{build}
Index: libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/clog.sh.cpp
===================================================================
--- libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/clog.sh.cpp
+++ libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/clog.sh.cpp
@@ -10,8 +10,6 @@
 
 // istream clog;
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 // UNSUPPORTED: executor-has-no-bash
 // FILE_DEPENDENCIES: ../check-stderr.sh
 // RUN: %{build}
Index: libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cout.sh.cpp
===================================================================
--- libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cout.sh.cpp
+++ libcxx/test/std/input.output/iostream.objects/narrow.stream.objects/cout.sh.cpp
@@ -10,8 +10,6 @@
 
 // istream cout;
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 // UNSUPPORTED: executor-has-no-bash
 // FILE_DEPENDENCIES: ../check-stdout.sh
 // RUN: %{build}
Index: libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcerr.sh.cpp
===================================================================
--- libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcerr.sh.cpp
+++ libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcerr.sh.cpp
@@ -11,7 +11,6 @@
 // istream wcerr;
 
 // XFAIL: libcpp-has-no-wide-characters
-// XFAIL: LIBCXX-WINDOWS-FIXME
 
 // UNSUPPORTED: executor-has-no-bash
 // FILE_DEPENDENCIES: ../check-stderr.sh
Index: libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wclog.sh.cpp
===================================================================
--- libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wclog.sh.cpp
+++ libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wclog.sh.cpp
@@ -11,7 +11,6 @@
 // istream wclog;
 
 // XFAIL: libcpp-has-no-wide-characters
-// XFAIL: LIBCXX-WINDOWS-FIXME
 
 // UNSUPPORTED: executor-has-no-bash
 // FILE_DEPENDENCIES: ../check-stderr.sh
Index: libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcout.sh.cpp
===================================================================
--- libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcout.sh.cpp
+++ libcxx/test/std/input.output/iostream.objects/wide.stream.objects/wcout.sh.cpp
@@ -11,7 +11,6 @@
 // istream wcout;
 
 // XFAIL: libcpp-has-no-wide-characters
-// XFAIL: LIBCXX-WINDOWS-FIXME
 
 // UNSUPPORTED: executor-has-no-bash
 // FILE_DEPENDENCIES: ../check-stdout.sh
Index: libcxx/utils/libcxx/test/features.py
===================================================================
--- libcxx/utils/libcxx/test/features.py
+++ libcxx/utils/libcxx/test/features.py
@@ -74,8 +74,14 @@
 
   # Whether Bash can run on the executor.
   # This is not always the case, for example when running on embedded systems.
+  #
+  # For the corner case of bash existing, but it being missing in the path
+  # set in %{exec} as "--env PATH=one-single-dir", the executor does find
+  # and executes bash, but bash then can't find any other common shell
+  # utilities. Test executing "bash -c 'bash --version'" to see if bash
+  # manages to find binaries to execute.
   Feature(name='executor-has-no-bash',
-          when=lambda cfg: runScriptExitCode(cfg, ['%{exec} bash --version']) != 0),
+          when=lambda cfg: runScriptExitCode(cfg, ['%{exec} bash -c \'bash --version\'']) != 0),
 
   Feature(name='apple-clang',                                                                                                      when=_isAppleClang),
   Feature(name=lambda cfg: 'apple-clang-{__clang_major__}'.format(**compilerMacros(cfg)),                                          when=_isAppleClang),