diff --git a/src/meta_plugin/system.rs b/src/meta_plugin/system.rs
index 447e25e..b1b2723 100644
--- a/src/meta_plugin/system.rs
+++ b/src/meta_plugin/system.rs
@@ -72,7 +72,7 @@ impl BinaryMetaPlugin {
         }
         
         // Final fallback: check printable character ratio
-        Self::calculate_printable_ratio(data) < 0.3
+        Self::calculate_printable_ratio(data) < 0.7
     }
     
     /// Check for known binary file signatures