diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index 2ab96b3f..8eb5a7a8 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -20,11 +20,8 @@ jobs:
         python-version: ["3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
     runs-on: ${{ matrix.os }}
-    defaults:
-      run:
-        shell: bash -l {0}
-    env:
-      PIP_BREAK_SYSTEM_PACKAGES: 1
+    # removed: defaults.run.shell: bash -l {0}
+    # removed: env.PIP_BREAK_SYSTEM_PACKAGES
     steps:
     - name: Checkout
       uses: actions/checkout@v2
@@ -40,15 +37,16 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Update build tools
-      run: python3 -m pip install --upgrade pip
-      if: matrix.os != 'macos-latest'
+        allow-prereleases: true
+    - name: Check interpreter
+      run: |
+        which -a python python3
+        python -c "import sys; print(sys.executable, sys.prefix)"
     - name: Install Package
-      run: python3 -m pip install -e .[test]
+      run: python -m pip install -e ".[test]"
     - name: Install Extras Package
       run: python3 -m pip install -e ./extras[test,application,image,vnd_openxmlformats]
     - name: MyPy
-      if: ${{ matrix.python-version != '3.11' }}
       run: mypy --install-types --non-interactive --no-warn-unused-ignores --python-version "${{ matrix.python-version }}" .
     - name: Pytest
       run: pytest -vvs --cov fileformats --cov-config .coveragerc --cov-report xml .
diff --git a/extras/pyproject.toml b/extras/pyproject.toml
index 434ccd63..8e3ce066 100644
--- a/extras/pyproject.toml
+++ b/extras/pyproject.toml
@@ -7,7 +7,7 @@ name = "fileformats-extras"
 description = "Extra methods for accessing and manipulating the underlying data referenced by fileformats classes"
 readme = "README.rst"
 requires-python = ">=3.11"
-dependencies = ["fileformats", "pydra >=1.0a"]
+dependencies = ["fileformats >=0.17.5", "pydra >=1.0a"]
 license = { file = "LICENSE" }
 authors = [{ name = "Thomas G. Close", email = "tom.g.close@gmail.com" }]
 maintainers = [{ name = "Thomas G. Close", email = "tom.g.close@gmail.com" }]
diff --git a/fileformats/core/extras.py b/fileformats/core/extras.py
index 993522a0..3c84f179 100644
--- a/fileformats/core/extras.py
+++ b/fileformats/core/extras.py
@@ -64,6 +64,14 @@ def decorated_extra(obj: DataType, *args: ty.Any, **kwargs: ty.Any) -> ty.Any:
                             '. Was not able to check whether an "extras" package '
                             f"({xtra.pypi}) exists on PyPI or not"
                         )
+                elif xtra.pkg:
+                    msg += (
+                        f'. The "{xtra.pkg}" extras module is installed but doesn\'t '
+                        "register an implementation, which can happen when it is out of "
+                        'date with respect to the installed "fileformats" package, so '
+                        "try upgrading it (e.g. "
+                        f"'pip install --upgrade {xtra.pypi}') and check again"
+                    )
             raise FileFormatsExtrasNotImplementedError(msg) from None
 
     # Store single dispatch method on the decorated function so we can register
diff --git a/fileformats/core/identification.py b/fileformats/core/identification.py
index 869bf9ba..6a06d119 100644
--- a/fileformats/core/identification.py
+++ b/fileformats/core/identification.py
@@ -38,6 +38,11 @@
     "testing",
     "vendor.testing",
 ]
+# Namespaces that are shipped within the main "fileformats" package, and therefore have
+# their "extras" implementations bundled together in the "fileformats-extras" package.
+# Note that "generic" is included here even though it isn't a "standard" type registry,
+# since generic types are defined in the main package alongside the standard ones
+BUNDLED_EXTRAS_NAMESPACES = ALL_STANDARD_TYPE_REGISTRIES + ["generic"]
 
 
 def find_matching(
diff --git a/fileformats/core/utils.py b/fileformats/core/utils.py
index 21688ea7..41b5ce78 100644
--- a/fileformats/core/utils.py
+++ b/fileformats/core/utils.py
@@ -272,7 +272,7 @@ def import_extras_module(klass: ty.Type["fileformats.core.DataType"]) -> ExtrasM
     sub_pkg : str
         the name of the sub-package that was attempted to be loaded
     """
-    from .identification import IANA_MIME_TYPE_REGISTRIES
+    from .identification import BUNDLED_EXTRAS_NAMESPACES
 
     # Check for Mock class
     try:
@@ -293,7 +293,7 @@ def import_extras_module(klass: ty.Type["fileformats.core.DataType"]) -> ExtrasM
         )
         return ExtrasModule(True, None, None)
     extras_pkg = "fileformats.extras." + sub_pkg.replace("-", "_")
-    if sub_pkg in IANA_MIME_TYPE_REGISTRIES + ["testing"]:
+    if sub_pkg in BUNDLED_EXTRAS_NAMESPACES:
         extras_pypi = "fileformats-extras"
     elif klass.vendor:
         extras_pypi = f"fileformats-{klass.vendor}-extras"
@@ -302,7 +302,13 @@ def import_extras_module(klass: ty.Type["fileformats.core.DataType"]) -> ExtrasM
     try:
         importlib.import_module(extras_pkg)
     except ModuleNotFoundError as e:
-        if str(e) != f"No module named '{extras_pkg}'":
+        # The missing module can be a parent of the extras package rather than the
+        # package itself, e.g. importing "fileformats.extras.vendor.<vendor>.<namespace>"
+        # when there is no "fileformats.extras.vendor.<vendor>" sub-package at all.
+        # Errors raised from *within* the extras module are still propagated
+        if not e.name or not (
+            extras_pkg == e.name or extras_pkg.startswith(e.name + ".")
+        ):
             raise
         extras_imported = False
     else: