diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..9b38853
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,7 @@
+{
+    "python.testing.pytestArgs": [
+        "tests"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index 5f75d5a..867373c 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ To open a file:
 ```python
 import FourDimensionalData
 
-data = FourDimensionalData("my_data.blo")
+data = FourDimensionalData.from_file("my_data.blo")
 ```
 
 ### Issues
diff --git a/data4d/__init__.py b/data4d/__init__.py
index bbc63af..25956a4 100644
--- a/data4d/__init__.py
+++ b/data4d/__init__.py
@@ -1,3 +1,8 @@
+from pathlib import Path
+
 from .TVIPS import TVIPS
 from .base import FourDimensionalData
 from .blockfile import BLO
+
+__version__ = open(Path(__file__).parent.joinpath("VERSION")).read().strip()
+__all__ = ["FourDimensionalData", "BLO", "TVIPS"]
diff --git a/data4d/base.py b/data4d/base.py
index 47f4b63..026e778 100644
--- a/data4d/base.py
+++ b/data4d/base.py
@@ -421,10 +421,10 @@ def from_file(fname: Union[str, Path]) -> FourDimensionalData:
         handler = {"blo": BLO, "tvips": TVIPS}
 
         fname = Path(fname)
-        ext = fname.suffix.strip(os.extsep)
+        ext = fname.suffix.strip(os.extsep).lower()
 
         if ext not in handler:
-            raise TypeError(
+            raise ValueError(
                 f"File format not supported. Supported formats are: {handler.keys()}."
             )
         return handler[ext](fname)
diff --git a/setup.cfg b/setup.cfg
index 9fb17f6..5af8133 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,7 +16,7 @@ classifiers =
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
-description = Parsers for Four Dimensional Electron Microscopy Data
+description = Parsers, Classes, and Functions for Four Dimensional Electron Microscopy Data
 long_description = file: README.md
 keywords = electron microcopy, diffraction, multi-dimensional data
 license_files = 
diff --git a/tests/test_import.py b/tests/test_import.py
new file mode 100644
index 0000000..5cbb9e3
--- /dev/null
+++ b/tests/test_import.py
@@ -0,0 +1,5 @@
+def test_version():
+    from data4d import __version__
+    from packaging.version import parse
+
+    assert parse(__version__) >= parse("0.1.0")