diff --git a/src/pymod/unit_tests/pymod_tests.cc b/src/pymod/unit_tests/pymod_tests.cc
index 87c01336b..f816e4f3b 100644
--- a/src/pymod/unit_tests/pymod_tests.cc
+++ b/src/pymod/unit_tests/pymod_tests.cc
@@ -31,38 +31,30 @@
 #define _STRINGIFY(s) #s
 
 #include "tlUnitTest.h"
+#include "tlStream.h"
 
-#if defined(HAVE_QT)
-# include <QProcess>
-# include <QProcessEnvironment>
-#endif
-
-int run_pymodtest (tl::TestBase * /*_this*/, const std::string &fn)
+int run_pymodtest (tl::TestBase *_this, const std::string &fn)
 {
-#if defined(HAVE_QT)
-  QProcess process;
-  process.setProcessChannelMode (QProcess::MergedChannels);
-
-  QStringList args;
+  static std::string pypath;
+  pypath = "PYTHONPATH=";
+  pypath += STRINGIFY (PYTHONPATH);
+  putenv ((char *) pypath.c_str ());
 
   std::string fp (tl::testsrc ());
   fp += "/testdata/pymod/";
   fp += fn;
-  args << tl::to_qstring (fp);
 
-  QProcessEnvironment env = QProcessEnvironment::systemEnvironment ();
-  env.insert("PYTHONPATH", STRINGIFY (PYTHONPATH));
-  process.setProcessEnvironment(env);
+  std::string text;
+  {
+    tl::InputPipe pipe (std::string (STRINGIFY (PYTHON)) + " " + fp + " 2>&1");
+    tl::InputStream is (pipe);
+    text = is.read_all ();
+  }
 
-  process.start (tl::to_qstring (STRINGIFY (PYTHON)), args);
-  process.waitForFinished (-1);
+  tl::info << text;
+  EXPECT_EQ (text.find ("OK") != std::string::npos, true);
 
-  tl::info << process.readAll ().constData ();
-
-  return process.exitCode ();
-#else
-  return 1; // TODO: provide a Qt-less version
-#endif
+  return 0;
 }
 
 #define PYMODTEST(n, file) \
diff --git a/src/tl/tl/tlStream.cc b/src/tl/tl/tlStream.cc
index 6fc993435..33124c45b 100644
--- a/src/tl/tl/tlStream.cc
+++ b/src/tl/tl/tlStream.cc
@@ -861,7 +861,91 @@ OutputZLibFile::write (const char *b, size_t n)
   }
 }
 
-#ifndef _WIN32 // not available on Windows
+#if defined(_WIN32)
+
+// ---------------------------------------------------------------
+//  InputPipe delegate implementation
+
+InputPipe::InputPipe (const std::string &path)
+  : m_file (NULL)
+{
+  std::wstring wpath = tl::to_wstring (path);
+  m_source = path;
+  m_file = _wpopen (wpath.c_str (), "r");
+  if (m_file == NULL) {
+    throw FilePOpenErrorException (m_source, errno);
+  }
+}
+
+InputPipe::~InputPipe ()
+{
+  close ();
+}
+
+void
+InputPipe::close ()
+{
+  if (m_file != NULL) {
+    fclose (m_file);
+    m_file = NULL;
+  }
+}
+
+size_t
+InputPipe::read (char *b, size_t n)
+{
+  tl_assert (m_file != NULL);
+  size_t ret = fread (b, 1, n, m_file);
+  if (ret < n) {
+    if (ferror (m_file)) {
+      throw FilePReadErrorException (m_source, ferror (m_file));
+    }
+  }
+
+  return ret;
+}
+
+void
+InputPipe::reset ()
+{
+  throw tl::Exception (tl::to_string (tr ("'reset' is not supported on pipeline input files")));
+}
+
+// ---------------------------------------------------------------
+//  OutputPipe delegate implementation
+
+OutputPipe::OutputPipe (const std::string &path)
+  : m_file (NULL)
+{
+  std::wstring wpath = tl::to_wstring (path);
+  m_source = path;
+  m_file = _wpopen (wpath.c_str (), "w");
+  if (m_file == NULL) {
+    throw FilePOpenErrorException (m_source, errno);
+  }
+}
+
+OutputPipe::~OutputPipe ()
+{
+  if (m_file != NULL) {
+    fclose (m_file);
+    m_file = NULL;
+  }
+}
+
+void
+OutputPipe::write (const char *b, size_t n)
+{
+  tl_assert (m_file != NULL);
+  size_t ret = fwrite (b, 1, n, m_file);
+  if (ret < n) {
+    if (ferror (m_file)) {
+      throw FilePWriteErrorException (m_source, ferror (m_file));
+    }
+  }
+}
+
+#else
 
 // ---------------------------------------------------------------
 //  InputPipe delegate implementation
@@ -943,58 +1027,6 @@ OutputPipe::write (const char *b, size_t n)
   }
 }
 
-#else
-
-// ---------------------------------------------------------------
-//  InputPipe delegate implementation
-
-InputPipe::InputPipe (const std::string & /*path*/)
-  : m_file (NULL)
-{
-  // TODO: emulate?
-}
-
-InputPipe::~InputPipe ()
-{
-}
-
-size_t 
-InputPipe::read (char * /*b*/, size_t /*n*/)
-{
-  throw tl::Exception (tl::to_string (tr ("pipeline input files not available on Windows")));
-}
-
-void 
-InputPipe::reset ()
-{
-  throw tl::Exception (tl::to_string (tr ("pipeline input files not available on Windows")));
-}
-
-void
-InputPipe::close ()
-{
-  throw tl::Exception (tl::to_string (tr ("pipeline input files not available on Windows")));
-}
-
-// ---------------------------------------------------------------
-//  OutputPipe delegate implementation
-
-OutputPipe::OutputPipe (const std::string & /*path*/)
-  : m_file (NULL)
-{
-  // TODO: emulate?
-}
-
-OutputPipe::~OutputPipe ()
-{
-}
-
-void 
-OutputPipe::write (const char * /*b*/, size_t /*n*/)
-{
-  throw tl::Exception (tl::to_string (tr ("pipeline input files not available on Windows")));
-}
-
 #endif
 
 // ---------------------------------------------------------------
diff --git a/src/tl/tl/tlStream.h b/src/tl/tl/tlStream.h
index 7ac4c19d4..dfabc6d4d 100644
--- a/src/tl/tl/tlStream.h
+++ b/src/tl/tl/tlStream.h
@@ -171,7 +171,7 @@ private:
  *
  *  Implements the reader for a zlib stream
  */
-class InputZLibFile
+class TL_PUBLIC InputZLibFile
   : public InputStreamBase
 {
 public:
@@ -224,7 +224,7 @@ private:
  *
  *  Implements the reader for ordinary files.
  */
-class InputFile
+class TL_PUBLIC InputFile
   : public InputStreamBase
 {
 public:
@@ -272,7 +272,7 @@ private:
  *
  *  Implements the reader for pipe streams
  */
-class InputPipe
+class TL_PUBLIC InputPipe
   : public InputStreamBase
 {
 public: