diff --git a/tools/logon.cmd b/tools/logon.cmd
index cea49c6..72fd79d 100644
--- a/tools/logon.cmd
+++ b/tools/logon.cmd
@@ -330,6 +330,10 @@ if seafile_domain == 0 (
     /v "PreconfigureUsername" /d "%USERNAME%@%seafile_domain%" /t REG_SZ /f 1>nul
   reg add "HKCU\SOFTWARE\SeaFile" ^
     /v "PreconfigureUserToken" /d "dummy" /t REG_SZ /f 1>nul
+
+  rem hide seafile main window ...
+  reg add "HKCU\SOFTWARE\SeaFile\Seafile Client\Behavior" ^
+    /v "hideMainWindowWhenStarted" /d "true" /t REG_SZ /f 1>nul
 )
 :SEAFILE_DONE