diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 0f45b89..2f58ab6 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -27,10 +27,32 @@ jobs:
         uses: actions/checkout@v3
       - name: Install
         run: |
-          pip install -r requirements.dev.txt
-          pip install .
+          pip3 install -r requirements.dev.txt
+          pip3 install .
       - name: Run tests
-        run: pytest
+        run: python3 -m pytest
+  wintest:
+    runs-on: windows-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install
+        run: |
+          pip3 install -r requirements.dev.txt
+          pip3 install .
+      - name: Run tests
+        run: python3 -m pytest
+  mactest:
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install
+        run: |
+          pip3 install -r requirements.dev.txt
+          pip3 install .
+      - name: Run tests
+        run: python3 -m pytest
   nodetest:
     runs-on: ubuntu-latest
     steps:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1c06a20..67e1ef4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ include(CheckSymbolExists)
 include(CheckLibraryExists)
 include(TestBigEndian)
 
-project(soundswallower VERSION 0.4.0
+project(soundswallower VERSION 0.4.1
   DESCRIPTION "An even smaller speech recognizer")
 
 if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
diff --git a/pyproject.toml b/pyproject.toml
index 35c54b5..7a26a44 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,12 +9,12 @@ requires = [
 ]
 build-backend = "setuptools.build_meta"
 [tool.cibuildwheel]
-# Build the versions found in Ubuntu LTS, the stable PyPy, and 3.10
-# everywhere else
+# Build the versions found in Ubuntu LTS, the stable PyPy, Anaconda on Windows
 build = [
       "pp38*",
       "cp36-manylinux_*",
       "cp38-manylinux_*",
+	  "cp39-win*",
       "cp310-*"
 ]
 # PyPy 3.8 will choke on CPython 3.8 build leftovers...
diff --git a/setup.cfg b/setup.cfg
index 9bda161..21a110b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = soundswallower
-version = 0.4.0
+version = 0.4.1
 description = An even smaller speech recognizer
 long_description = file: README.md
 long_description_content_type = text/markdown
diff --git a/src/decoder.c b/src/decoder.c
index 9b3a125..892549c 100644
--- a/src/decoder.c
+++ b/src/decoder.c
@@ -71,6 +71,11 @@ expand_file_config(config_t *config, const char *arg,
     }
 }
 #else
+#ifdef WIN32
+#define PATHSEP "\\"
+#else
+#define PATHSEP "/"
+#endif
 static int
 file_exists(const char *path)
 {
@@ -87,7 +92,7 @@ expand_file_config(config_t *config, const char *arg,
 {
     const char *val;
     if ((val = config_str(config, arg)) == NULL) {
-        char *tmp = string_join(hmmdir, "/", file, NULL);
+        char *tmp = string_join(hmmdir, PATHSEP, file, NULL);
         if (file_exists(tmp))
 	    config_set_str(config, arg, tmp);
 	else
@@ -124,9 +129,10 @@ config_expand(config_t *config)
 #else
     /* Look for feat_params.json in acoustic model dir. */
     if ((featparams = config_str(config, "featparams")) != NULL) {
-        FILE *json = fopen(featparams, "rt");
+        /* Open in binary mode so fread() matches ftell() on Windows */
+        FILE *json = fopen(featparams, "rb");
         char *jsontxt;
-        size_t len;
+        size_t len, rv;
 
         if (json == NULL)
             return;
@@ -138,8 +144,9 @@ config_expand(config_t *config)
         }
         jsontxt = malloc(len + 1);
         jsontxt[len] = '\0';
-        if (fread(jsontxt, 1, len, json) != len) {
-            E_ERROR_SYSTEM("Failed to read %s", featparams);
+        if ((rv = fread(jsontxt, 1, len, json)) != len) {
+            E_ERROR_SYSTEM("Failed to read %s (got %zu not %zu)",
+                           featparams, rv, len);
             ckd_free(jsontxt);
             return;
         }