diff --git a/fileprefix.py b/fileprefix.py
index c8e5f4c..2493837 100644
--- a/fileprefix.py
+++ b/fileprefix.py
@@ -42,7 +42,7 @@ def fileprefix(
 
     filepaths = current_directory.listdir()
     filepaths = [f for f in filepaths if f.is_file]
-    filepaths = [f for f in filepaths if f.extension.lower() not in IGNORE_EXTENSIONS]
+    filepaths = [f for f in filepaths if f.extension not in IGNORE_EXTENSIONS]
 
     try:
         pyfile = pathclass.Path(__file__)
diff --git a/search.py b/search.py
index 8bcd7c7..1e53be6 100644
--- a/search.py
+++ b/search.py
@@ -192,7 +192,7 @@ def search(
         if not filepath.is_file:
             continue
 
-        if filepath.extension.lower() == 'lnk' and winshell:
+        if filepath.extension == 'lnk' and winshell:
             yield from search_contents_windows_lnk(filepath, content_args)
         else:
             yield from search_contents_generic(filepath, content_args)