diff --git a/main.py b/main.py
index 5c6b16c..002b6ca 100644
--- a/main.py
+++ b/main.py
@@ -18,7 +18,8 @@
 import uuid
 import magic  # python-magic for MIME sniffing
 
-load_dotenv()
+# Support UTF-8 BOM in .env files commonly saved by Windows tools.
+load_dotenv(encoding="utf-8-sig")
 
 # ─── LOGGING ─────────────────────────────────────────────────────────────────
 
@@ -62,6 +63,7 @@
     "application/xml",
     "text/xml",
     "text/x-log",
+    "unknown",  # windows/libmagic fallback; extension checks still enforce allowed file types
     "application/octet-stream",  # fallback for .log/.evtx on some systems
 }
 MAX_FILE_SIZE_BYTES = 50 * 1024 * 1024  # 50 MB
diff --git a/requirements.txt b/requirements.txt
index 49151a5..0a86162 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 fastapi
 uvicorn
 python-multipart
-python-magic
+python-magic-bin
 slowapi
 python-jose[cryptography]
 bcrypt