diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb59f4f..cc794ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+Version 2.0.2
+-------------
+
+- Fixing #137 passing non-existent filename to from_string()/from_stream() no longer raises FileNotFoundError (thanks to denisw)
+
 Version 2.0.1
 -------------
 
diff --git a/puremagic/main.py b/puremagic/main.py
index d9e2ef6..2ca1e7c 100644
--- a/puremagic/main.py
+++ b/puremagic/main.py
@@ -34,7 +34,7 @@
     )
 
 __author__ = "Chris Griffith"
-__version__ = "2.0.1"
+__version__ = "2.0.2"
 __all__ = [
     "magic_file",
     "magic_string",
@@ -208,7 +208,7 @@ def perform_magic(header: bytes, footer: bytes, mime: bool, ext=None, filename=N
     if not header:
         raise PureValueError("Input was empty")
     infos = identify_all(header, footer, ext)
-    if filename and os.getenv("PUREMAGIC_DEEPSCAN") != "0":
+    if filename and os.path.isfile(filename) and os.getenv("PUREMAGIC_DEEPSCAN") != "0":
         results = run_deep_scan(infos, filename, header, footer, raise_on_none=True)
         if results:
             if results[0].extension == "":
@@ -362,7 +362,7 @@ def magic_string(string, filename: os.PathLike | str | None = None) -> list[Pure
     ext = ext_from_filename(filename) if filename else None
     info = identify_all(head, foot, ext)
     info.sort(key=lambda x: x.confidence, reverse=True)
-    if filename and os.getenv("PUREMAGIC_DEEPSCAN") != "0":
+    if filename and os.path.isfile(filename) and os.getenv("PUREMAGIC_DEEPSCAN") != "0":
         return run_deep_scan(info, filename, head, foot, raise_on_none=False)
     return info
 
@@ -385,7 +385,7 @@ def magic_stream(
     ext = ext_from_filename(filename) if filename else None
     info = identify_all(head, foot, ext)
     info.sort(key=lambda x: x.confidence, reverse=True)
-    if filename and os.getenv("PUREMAGIC_DEEPSCAN") != "0":
+    if filename and os.path.isfile(filename) and os.getenv("PUREMAGIC_DEEPSCAN") != "0":
         return run_deep_scan(info, filename, head, foot, raise_on_none=False)
     return info
 
diff --git a/test/test_scanners.py b/test/test_scanners.py
index bb9bd52..b14344b 100644
--- a/test/test_scanners.py
+++ b/test/test_scanners.py
@@ -57,6 +57,19 @@ def test_utf16_le_csv_deep_scan():
     assert results[0].confidence >= 0.9
 
 
+def test_from_string_nonexistent_filename():
+    # GH #137: passing filename for extension hint should not raise FileNotFoundError
+    # Use PDF-like bytes so identify_all finds a match via magic numbers,
+    # then deep scan is skipped (file doesn't exist) and the match is returned.
+    pdf_bytes = b"%PDF-1.4 fake content"
+    result = puremagic.from_string(pdf_bytes, filename="nonexistent.pdf")
+    assert result == ".pdf"
+
+    # magic_string should also work without crashing
+    results = puremagic.magic_string(pdf_bytes, filename="nonexistent.pdf")
+    assert any(r.extension == ".pdf" for r in results)
+
+
 def test_python_scanner():
     # Test the Python scanner with a sample Python file
     py_file = SYSTEM_DIR / "test.py"