diff --git a/CHANGELOG.md b/CHANGELOG.md
index f48d97142..db22e7e55 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,8 @@
-## 0.4.3-dev1
+## 0.4.3-dev2
 
 * Fix in `exceeds_cap_ratio` so the function doesn't break with empty text
 * Fix bug in `_parse_received_data`.
+* Update `detect_filetype` to properly handle `.doc`, `.xls`, and `.ppt`.
 
 ## 0.4.2
 
diff --git a/test_unstructured/file_utils/test_filetype.py b/test_unstructured/file_utils/test_filetype.py
index df4780185..e4a5cffa4 100644
--- a/test_unstructured/file_utils/test_filetype.py
+++ b/test_unstructured/file_utils/test_filetype.py
@@ -88,6 +88,24 @@ def test_detect_application_zip_files(monkeypatch, tmpdir):
     assert filetype == FileType.ZIP
 
 
+def test_detect_doc_file_from_mime_type(monkeypatch):
+    monkeypatch.setattr(magic, "from_file", lambda *args, **kwargs: "application/msword")
+    filetype = detect_filetype(filename="fake.doc")
+    assert filetype == FileType.DOC
+
+
+def test_detect_ppt_file_from_mime_type(monkeypatch):
+    monkeypatch.setattr(magic, "from_file", lambda *args, **kwargs: "application/vnd.ms-powerpoint")
+    filetype = detect_filetype(filename="fake.ppt")
+    assert filetype == FileType.PPT
+
+
+def test_detect_xls_file_from_mime_type(monkeypatch):
+    monkeypatch.setattr(magic, "from_file", lambda *args, **kwargs: "application/vnd.ms-excel")
+    filetype = detect_filetype(filename="fake.xls")
+    assert filetype == FileType.XLS
+
+
 def test_detect_xlsx_filetype_application_octet_stream(monkeypatch):
     monkeypatch.setattr(magic, "from_buffer", lambda *args, **kwargs: "application/octet-stream")
     filename = os.path.join(EXAMPLE_DOCS_DIRECTORY, "fake-excel.xlsx")
diff --git a/unstructured/__version__.py b/unstructured/__version__.py
index 4b2a24857..c5b74f907 100644
--- a/unstructured/__version__.py
+++ b/unstructured/__version__.py
@@ -1 +1 @@
-__version__ = "0.4.3-dev1"  # pragma: no cover
+__version__ = "0.4.3-dev2"  # pragma: no cover
diff --git a/unstructured/file_utils/filetype.py b/unstructured/file_utils/filetype.py
index e206315d2..be8b37b7c 100644
--- a/unstructured/file_utils/filetype.py
+++ b/unstructured/file_utils/filetype.py
@@ -11,14 +11,25 @@ from unstructured.nlp.patterns import EMAIL_HEAD_RE
 
 DOCX_MIME_TYPES = [
     "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+]
+
+DOC_MIME_TYPES = [
     "application/msword",
 ]
+
 XLSX_MIME_TYPES = [
     "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+]
+
+XLS_MIME_TYPES = [
     "application/vnd.ms-excel",
 ]
+
 PPTX_MIME_TYPES = [
     "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+]
+
+PPT_MIME_TYPES = [
     "application/vnd.ms-powerpoint",
 ]
 
@@ -125,6 +136,9 @@ def detect_filetype(
     elif mime_type in DOCX_MIME_TYPES:
         return FileType.DOCX
 
+    elif mime_type in DOC_MIME_TYPES:
+        return FileType.DOC
+
     elif mime_type == "image/jpeg":
         return FileType.JPG
 
@@ -157,9 +171,15 @@ def detect_filetype(
     elif mime_type in XLSX_MIME_TYPES:
         return FileType.XLSX
 
+    elif mime_type in XLS_MIME_TYPES:
+        return FileType.XLS
+
     elif mime_type in PPTX_MIME_TYPES:
         return FileType.PPTX
 
+    elif mime_type in PPT_MIME_TYPES:
+        return FileType.PPT
+
     elif mime_type == "application/octet-stream":
         if file and not extension:
             return _detect_filetype_from_octet_stream(file=file)