diff --git a/apps/ai-game-creator-shell/src-tauri/src/export/registry.rs b/apps/ai-game-creator-shell/src-tauri/src/export/registry.rs
index 7033e8c9c..569758eb9 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/export/registry.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/export/registry.rs
@@ -8,6 +8,7 @@ use std::fmt;
 use std::fs;
 use std::io::Write as _;
 use std::path::{Path, PathBuf};
+use std::sync::atomic::Ordering;
 
 use serde::de::DeserializeOwned;
 use serde::Serialize;
@@ -150,9 +151,18 @@ fn temp_path(path: &Path) -> PathBuf {
         .file_name()
         .map(|name| name.to_string_lossy().into_owned())
         .unwrap_or_else(|| "registry.json".to_string());
-    path.with_file_name(format!(".{file_name}.{}.tmp", std::process::id()))
+    // 临时文件名必须**每次写都不同**：只用 pid 的话，同一进程里两个并发写共用同一个临时文件，
+    // 一个会截断另一个正在写的内容，rename 也会互相抢。进程内原子计数器保证不重名。
+    let sequence = TEMP_FILE_SEQUENCE.fetch_add(1, Ordering::Relaxed);
+    path.with_file_name(format!(
+        ".{file_name}.{}.{sequence}.tmp",
+        std::process::id()
+    ))
 }
 
+/// 同进程内临时文件名的序号，见 [`temp_path`]。
+static TEMP_FILE_SEQUENCE: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0);
+
 #[cfg(test)]
 mod tests {
     use super::*;