diff --git a/apps/desktop/src-tauri/src/agent.rs b/apps/desktop/src-tauri/src/agent.rs
index dc2126b..ab787d8 100644
--- a/apps/desktop/src-tauri/src/agent.rs
+++ b/apps/desktop/src-tauri/src/agent.rs
@@ -759,6 +759,18 @@ fn collect_windows_extended() -> serde_json::Value {
         }
     }
 
+    fn preview_base64(bytes: &[u8], max_len: usize) -> String {
+        if bytes.is_empty() {
+            return "<empty>".to_string();
+        }
+        let prefix = if bytes.len() > max_len {
+            &bytes[..max_len]
+        } else {
+            bytes
+        };
+        format!("base64:{}...", STANDARD.encode(prefix))
+    }
+
     fn encode_ps_script(script: &str) -> String {
         let mut bytes = Vec::with_capacity(script.len() * 2);
         for unit in script.encode_utf16() {
@@ -790,13 +802,19 @@ fn collect_windows_extended() -> serde_json::Value {
                 let preview = txt.chars().take(512).collect::<String>();
                 eprintln!("[collect_windows_extended] stdout `{cmd}` => {preview}");
             } else {
-                eprintln!("[collect_windows_extended] stdout `{cmd}` => <vazio>");
+                let preview = preview_base64(&out.stdout, 512);
+                eprintln!(
+                    "[collect_windows_extended] stdout `{cmd}` => <não decodificado {preview}>"
+                );
             }
             if !out.stderr.is_empty() {
                 if let Some(err) = decode_powershell_text(&out.stderr) {
                     eprintln!("[collect_windows_extended] stderr `{cmd}` => {err}");
                 } else {
-                    eprintln!("[collect_windows_extended] stderr `{cmd}` => <binário>");
+                    let preview = preview_base64(&out.stderr, 512);
+                    eprintln!(
+                        "[collect_windows_extended] stderr `{cmd}` => <não decodificado {preview}>"
+                    );
                 }
             }
         }