diff --git a/src/esxi_mcp_server/mixins/guest_ops.py b/src/esxi_mcp_server/mixins/guest_ops.py
index c4fd647..f372607 100644
--- a/src/esxi_mcp_server/mixins/guest_ops.py
+++ b/src/esxi_mcp_server/mixins/guest_ops.py
@@ -308,16 +308,17 @@ class GuestOpsMixin(MCPMixin):
         except vim.fault.FileNotFound:
             raise ValueError(f"Directory not found: {guest_path}") from None
 
-        return [
-            {
+        results = []
+        for f in listing.files:
+            mod_time = getattr(f, "modificationTime", None)
+            results.append({
                 "name": f.path,
-                "size": f.size,
-                "type": f.type,
-                "owner": f.owner,
-                "modified": f.modificationTime.isoformat() if f.modificationTime else None,
-            }
-            for f in listing.files
-        ]
+                "size": getattr(f, "size", None),
+                "type": getattr(f, "type", None),
+                "owner": getattr(f, "owner", None),
+                "modified": mod_time.isoformat() if mod_time else None,
+            })
+        return results
 
     @mcp_tool(
         name="create_guest_directory",