diff --git a/rust/src/codex_accounts/codex_desktop.rs b/rust/src/codex_accounts/codex_desktop.rs
index 10eeedcf5c8..62b91f4c562 100644
--- a/rust/src/codex_accounts/codex_desktop.rs
+++ b/rust/src/codex_accounts/codex_desktop.rs
@@ -347,7 +347,8 @@ mod tests {
         std::fs::write(session.join("unrelated-file"), b"preserve").unwrap();
         let script = format!(
             r#"
-$fixturePackage = {package}
+# Match the restart script: Windows may expand an 8.3 temp path here.
+$fixturePackage = [System.IO.Path]::GetFullPath({package})
 $script:stopped = $false
 function Get-AppxPackage {{ [pscustomobject]@{{ InstallLocation = $fixturePackage; Version = '1.0' }} }}
 function Get-CimInstance {{
@@ -389,8 +390,12 @@ if (-not $script:stopped -or -not $script:launched) {{ throw 'Restart did not co
             .unwrap();
         assert!(
             output.status.success(),
-            "{}",
-            String::from_utf8_lossy(&output.stderr)
+            "exit={:?} stdout={} stderr={} fixture_log={}",
+            output.status.code(),
+            String::from_utf8_lossy(&output.stdout),
+            String::from_utf8_lossy(&output.stderr),
+            std::fs::read_to_string(dir.path().join("support/codex-desktop-restart.log"))
+                .unwrap_or_default()
         );
         assert!(!session.join("Local Storage").exists());
         assert!(!session.join("Preferences").exists());