diff --git a/gio/gcontenttype.c b/gio/gcontenttype.c
index 3e5b841ab..3c9522bc6 100644
--- a/gio/gcontenttype.c
+++ b/gio/gcontenttype.c
@@ -780,7 +780,7 @@ g_content_type_guess (const gchar  *filename,
   if (filename)
     {
       i = strlen (filename);
-      if (filename[i - 1] == '/')
+      if (i > 0 && filename[i - 1] == '/')
         {
           name_mimetypes[0] = "inode/directory";
           name_mimetypes[1] = NULL;
diff --git a/glib/gspawn-win32.c b/glib/gspawn-win32.c
index 30812dba6..fc2a96c94 100644
--- a/glib/gspawn-win32.c
+++ b/glib/gspawn-win32.c
@@ -637,6 +637,13 @@ fork_exec (gint                  *exit_status,
 
   argc = protect_argv (argv, &protected_argv);
 
+  /*
+   * FIXME: Workaround broken spawnvpe functions that SEGV when "=X:="
+   * environment variables are missing. Calling chdir() will set the magic
+   * environment variable again.
+   */
+  _chdir (".");
+
   if (stdin_fd == -1 && stdout_fd == -1 && stderr_fd == -1 &&
       (flags & G_SPAWN_CHILD_INHERITS_STDIN) &&
       !(flags & G_SPAWN_STDOUT_TO_DEV_NULL) &&
diff --git a/glib/tests/meson.build b/glib/tests/meson.build
index 11563bcfe..9b4e713fc 100644
--- a/glib/tests/meson.build
+++ b/glib/tests/meson.build
@@ -278,6 +278,16 @@ executable('test-spawn-echo', 'test-spawn-echo.c',
   install: installed_tests_enabled,
 )
 
+if host_machine.system() == 'windows'
+  # test-spawn-sleep helper binary required by the spawn tests above
+  executable('test-spawn-sleep', 'test-spawn-sleep.c',
+    c_args : test_cargs,
+    dependencies : test_deps,
+    install_dir: installed_tests_execdir,
+    install: installed_tests_enabled,
+  )
+endif
+
 executable('testing-helper', 'testing-helper.c',
   c_args : test_cargs,
   dependencies : test_deps,
diff --git a/glib/tests/option-argv0.c b/glib/tests/option-argv0.c
index 37ac44a9f..a18e68676 100644
--- a/glib/tests/option-argv0.c
+++ b/glib/tests/option-argv0.c
@@ -39,7 +39,6 @@ test_platform_argv0 (void)
   const gchar * const expected_prgnames[] =
     {
       "option-argv0",
-      "lt-option-argv0",
 #ifdef G_OS_WIN32
       "option-argv0.exe",
 #endif
diff --git a/glib/tests/spawn-multithreaded.c b/glib/tests/spawn-multithreaded.c
index 614e503ca..c73a23433 100644
--- a/glib/tests/spawn-multithreaded.c
+++ b/glib/tests/spawn-multithreaded.c
@@ -31,6 +31,7 @@
 #include <sys/types.h>
 
 static char *echo_prog_path;
+static char *sleep_prog_path;
 
 #ifdef G_OS_UNIX
 #include <unistd.h>
@@ -43,10 +44,6 @@ static char *echo_prog_path;
 static GMainLoop *global_main_loop;
 static guint alive;
 
-#ifdef G_OS_WIN32
-static char *argv0;
-#endif
-
 static GPid
 get_a_child (gint ttl)
 {
@@ -61,9 +58,9 @@ get_a_child (gint ttl)
   si.cb = sizeof (&si);
   memset (&pi, 0, sizeof (pi));
 
-  cmdline = g_strdup_printf ("child-test -c%d", ttl);
+  cmdline = g_strdup_printf ("%s %d", sleep_prog_path, ttl);
 
-  if (!CreateProcess (argv0, cmdline, NULL, NULL,
+  if (!CreateProcess (NULL, cmdline, NULL, NULL,
                       FALSE, 0, NULL, NULL, &si, &pi))
     g_error ("CreateProcess failed: %s",
              g_win32_error_message (GetLastError ()));
@@ -145,7 +142,7 @@ test_spawn_childs (void)
   global_main_loop = g_main_loop_new (NULL, FALSE);
 
 #ifdef G_OS_WIN32
-  system ("ipconfig /all");
+  system ("cd .");
 #else
   system ("true");
 #endif
@@ -172,7 +169,7 @@ test_spawn_childs_threads (void)
   global_main_loop = g_main_loop_new (NULL, FALSE);
 
 #ifdef G_OS_WIN32
-  system ("ipconfig /all");
+  system ("cd .");
 #else
   system ("true");
 #endif
@@ -384,14 +381,13 @@ main (int   argc,
 
   dirname = g_path_get_dirname (argv[0]);
   echo_prog_path = g_build_filename (dirname, "test-spawn-echo" EXEEXT, NULL);
-  if (!g_file_test (echo_prog_path, G_FILE_TEST_EXISTS))
-    {
-      g_free (echo_prog_path);
-      echo_prog_path = g_build_filename (dirname, "lt-test-spawn-echo" EXEEXT, NULL);
-    }
+  sleep_prog_path = g_build_filename (dirname, "test-spawn-sleep" EXEEXT, NULL);
   g_free (dirname);
 
   g_assert (g_file_test (echo_prog_path, G_FILE_TEST_EXISTS));
+#ifdef G_OS_WIN32
+  g_assert (g_file_test (sleep_prog_path, G_FILE_TEST_EXISTS));
+#endif
 
   g_test_add_func ("/gthread/spawn-childs", test_spawn_childs);
   g_test_add_func ("/gthread/spawn-childs-threads", test_spawn_childs_threads);
@@ -401,6 +397,7 @@ main (int   argc,
   ret = g_test_run();
 
   g_free (echo_prog_path);
+  g_free (sleep_prog_path);
 
   return ret;
 }
diff --git a/glib/tests/spawn-path-search.c b/glib/tests/spawn-path-search.c
index 2a8911139..5008fc960 100644
--- a/glib/tests/spawn-path-search.c
+++ b/glib/tests/spawn-path-search.c
@@ -23,6 +23,17 @@
 #include <sys/wait.h>
 #endif
 
+static gboolean
+skip_win32 (void)
+{
+#ifdef G_OS_WIN32
+  g_test_skip ("The test manipulate PATH, and breaks DLL lookups.");
+  return TRUE;
+#else
+  return FALSE;
+#endif
+}
+
 static void
 test_do_not_search (void)
 {
@@ -38,6 +49,9 @@ test_do_not_search (void)
   g_test_summary ("Without G_SPAWN_SEARCH_PATH, spawn-test-helper "
                   "means ./spawn-test-helper.");
 
+  if (skip_win32 ())
+    return;
+
   envp = g_environ_setenv (envp, "PATH", subdir, TRUE);
 
   g_ptr_array_add (argv,
@@ -90,6 +104,9 @@ test_search_path (void)
   g_test_summary ("With G_SPAWN_SEARCH_PATH, spawn-test-helper "
                   "means $PATH/spawn-test-helper.");
 
+  if (skip_win32 ())
+    return;
+
   envp = g_environ_setenv (envp, "PATH", subdir, TRUE);
 
   g_ptr_array_add (argv,
@@ -143,6 +160,9 @@ test_search_path_from_envp (void)
   g_test_summary ("With G_SPAWN_SEARCH_PATH_FROM_ENVP, spawn-test-helper "
                   "means $PATH/spawn-test-helper with $PATH from envp.");
 
+  if (skip_win32 ())
+    return;
+
   envp = g_environ_setenv (envp, "PATH", here, TRUE);
 
   g_ptr_array_add (argv,
@@ -198,6 +218,9 @@ test_search_path_ambiguous (void)
   g_test_summary ("With G_SPAWN_SEARCH_PATH and G_SPAWN_SEARCH_PATH_FROM_ENVP, "
                   "the latter wins.");
 
+  if (skip_win32 ())
+    return;
+
   envp = g_environ_setenv (envp, "PATH", here, TRUE);
 
   g_ptr_array_add (argv,
@@ -252,6 +275,10 @@ test_search_path_fallback_in_environ (void)
   int wait_status = -1;
 
   g_test_summary ("With G_SPAWN_SEARCH_PATH but no PATH, a fallback is used.");
+
+  if (skip_win32 ())
+    return;
+
   /* We can't make a meaningful assertion about what the fallback *is*,
    * but we can assert that it *includes* the current working directory. */
 
@@ -319,6 +346,9 @@ test_search_path_fallback_in_envp (void)
   /* We can't make a meaningful assertion about what the fallback *is*,
    * but we can assert that it *includes* the current working directory. */
 
+  if (skip_win32 ())
+    return;
+
   if (g_file_test ("/usr/bin/spawn-test-helper", G_FILE_TEST_IS_EXECUTABLE) ||
       g_file_test ("/bin/spawn-test-helper", G_FILE_TEST_IS_EXECUTABLE))
     {
@@ -384,6 +414,9 @@ test_search_path_heap_allocation (void)
   int wait_status = -1;
   gsize i;
 
+  if (skip_win32 ())
+    return;
+
   memset (placeholder, '_', sizeof (placeholder));
   /* Force search_path_buffer to be heap-allocated */
   long_dir = g_test_build_filename (G_TEST_BUILT, "path-test-subdir", placeholder, NULL);
diff --git a/glib/tests/spawn-singlethread.c b/glib/tests/spawn-singlethread.c
index 7711ba8fe..b17b47237 100644
--- a/glib/tests/spawn-singlethread.c
+++ b/glib/tests/spawn-singlethread.c
@@ -505,11 +505,6 @@ main (int   argc,
 
   dirname = g_path_get_dirname (argv[0]);
   echo_prog_path = g_build_filename (dirname, "test-spawn-echo" EXEEXT, NULL);
-  if (!g_file_test (echo_prog_path, G_FILE_TEST_EXISTS))
-    {
-      g_free (echo_prog_path);
-      echo_prog_path = g_build_filename (dirname, "lt-test-spawn-echo" EXEEXT, NULL);
-    }
   echo_script_path = g_build_filename (dirname, "echo-script" SCRIPT_EXT, NULL);
   if (!g_file_test (echo_script_path, G_FILE_TEST_EXISTS))
     {
diff --git a/glib/tests/test-spawn-sleep.c b/glib/tests/test-spawn-sleep.c
new file mode 100644
index 000000000..34dfd5bd9
--- /dev/null
+++ b/glib/tests/test-spawn-sleep.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2022 Red Hat, Inc.
+ *
+ * This work is provided "as is"; redistribution and modification
+ * in whole or in part, in any medium, physical or electronic is
+ * permitted without restriction.
+ *
+ * This work is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * In no event shall the authors or contributors be liable for any
+ * direct, indirect, incidental, special, exemplary, or consequential
+ * damages (including, but not limited to, procurement of substitute
+ * goods or services; loss of use, data, or profits; or business
+ * interruption) however caused and on any theory of liability, whether
+ * in contract, strict liability, or tort (including negligence or
+ * otherwise) arising in any way out of the use of this software, even
+ * if advised of the possibility of such damage.
+ */
+#include "config.h"
+
+#include <stdlib.h>
+#include "glib.h"
+
+int
+main (int   argc,
+      char *argv[])
+{
+  g_usleep (atoi (argv[1]) * G_USEC_PER_SEC);
+  return 0;
+}