Fixes, I hope.

app.py

@@ -12,6 +12,7 @@ from werkzeug.security import generate_password_hash, check_password_hash
 import markdown
 import logging
 import re
+from urllib.parse import quote
 from email import message_from_string
 from email.mime.text import MIMEText
 from whoosh.index import create_in, open_dir
@@ -359,7 +360,9 @@ def rewrite_eml_file_links(md_content, filepath):
         
         # Ensure forward slashes for URL
         resolved_path = resolved_path.replace(os.sep, '/')
-        file_url = f"/file/{resolved_path}"
+        # URL-encode the path, preserving forward slashes
+        encoded_path = quote(resolved_path, safe='/')
+        file_url = f"/file/{encoded_path}"
         
         return f"[{link_text}]({file_url})"