diff --git a/extlib/xgui/src/main/java/org/mini/apploader/AppManager.java b/extlib/xgui/src/main/java/org/mini/apploader/AppManager.java
index 1f067cd8..2ab222e1 100644
--- a/extlib/xgui/src/main/java/org/mini/apploader/AppManager.java
+++ b/extlib/xgui/src/main/java/org/mini/apploader/AppManager.java
@@ -23,6 +23,7 @@
 import org.mini.layout.xwebview.*;
 
 import java.io.*;
+import java.net.URLEncoder;
 import java.util.*;
 
 /**
@@ -825,7 +826,7 @@ void updateScriptEnvironment() {
         envVarProvider.setEnvVar("appid", AppLoader.getBaseInfo("appid"));
         envVarProvider.setEnvVar("appzone", AppLoader.getBaseInfo("appzone"));
         envVarProvider.setEnvVar("sver", AppLoader.getBaseInfo("sver"));
-        envVarProvider.setEnvVar("jar", System.getProperty("os.name").toLowerCase());
+        envVarProvider.setEnvVar("jar", URLEncoder.encode(System.getProperty("os.name").toLowerCase()));
         envVarProvider.setEnvVar("from", AppLoader.getBaseInfo("from"));
         envVarProvider.setEnvVar("cver", AppLoader.getBaseInfo("cver"));
         envVarProvider.setEnvVar("policy_url", AppLoader.getBaseInfo("policyUrl"));