diff --git a/app/main.py b/app/main.py
index 9866ac0..6c3533c 100644
--- a/app/main.py
+++ b/app/main.py
@@ -65,11 +65,11 @@ def open_text_with_fallbacks(file_path: str):
     """
     Open a text file trying multiple encodings commonly seen in legacy CSVs.
 
-    Attempts in order: utf-8, utf-8-sig, cp1252, latin-1.
+    Attempts in order: utf-8, utf-8-sig, cp1252, windows-1252, cp1250, iso-8859-1, latin-1.
 
     Returns a tuple of (file_object, encoding_used). Caller is responsible to close file.
     """
-    encodings = ["utf-8", "utf-8-sig", "cp1252", "latin-1"]
+    encodings = ["utf-8", "utf-8-sig", "cp1252", "windows-1252", "cp1250", "iso-8859-1", "latin-1"]
     last_error = None
     for enc in encodings:
         try:
@@ -81,8 +81,13 @@ def open_text_with_fallbacks(file_path: str):
             return f, enc
         except Exception as e:
             last_error = e
+            logger.warning("encoding_fallback_failed", file=file_path, encoding=enc, error=str(e))
             continue
-    raise last_error if last_error else RuntimeError("Unable to open file with known encodings")
+
+    error_msg = f"Unable to open file '{file_path}' with any of the supported encodings: {', '.join(encodings)}"
+    if last_error:
+        error_msg += f". Last error: {str(last_error)}"
+    raise RuntimeError(error_msg)
 
 
 # Configure Jinja2 templates