diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java b/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java
index a28db7e..de68eea 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java
@@ -5,6 +5,7 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 
+import org.gcube.portal.clientcontext.client.GCubeClientContext;
 import org.gcube.portlets.user.workspace.client.ConstantsExplorer.WS_UPLOAD_TYPE;
 import org.gcube.portlets.user.workspace.client.ConstantsExplorer.WsPortletInitOperation;
 import org.gcube.portlets.user.workspace.client.event.AccountingHistoryEvent;
@@ -938,7 +939,10 @@ public class AppControllerExplorer implements EventHandler, TreeAppControllerInt
 						if(fileDownloadEvent.getItemName()!= null){
 
 							try {
-								new RequestBuilderWorkspaceValidateItem(RequestBuilder.GET, ConstantsExplorer.DOWNLOAD_WORKSPACE_SERVICE, "id="+fileDownloadEvent.getItemIdentifier()+"&viewContent=true", "_blank", downloadHandlerCallback);
+								// Add currentContextId parameter
+								String currentContextId = GCubeClientContext.getCurrentContextId();
+								String queryString = "id="+fileDownloadEvent.getItemIdentifier()+"&viewContent=true&"+ConstantsExplorer.CONTEXT_ID+"="+currentContextId;
+								new RequestBuilderWorkspaceValidateItem(RequestBuilder.GET, ConstantsExplorer.DOWNLOAD_WORKSPACE_SERVICE, queryString, "_blank", downloadHandlerCallback);
 
 							} catch (Exception e) {
 								explorerPanel.getAsycTreePanel().unmask();
@@ -957,7 +961,10 @@ public class AppControllerExplorer implements EventHandler, TreeAppControllerInt
 
 						else {
 							try {
-								new RequestBuilderWorkspaceValidateItem(RequestBuilder.GET,ConstantsExplorer.DOWNLOAD_WORKSPACE_SERVICE, "id="+fileDownloadEvent.getItemIdentifier(), "_self", downloadHandlerCallback);
+								// Add currentContextId parameter
+								String currentContextId = GCubeClientContext.getCurrentContextId();
+								String queryString = "id="+fileDownloadEvent.getItemIdentifier()+"&"+ConstantsExplorer.CONTEXT_ID+"="+currentContextId;
+								new RequestBuilderWorkspaceValidateItem(RequestBuilder.GET,ConstantsExplorer.DOWNLOAD_WORKSPACE_SERVICE, queryString, "_self", downloadHandlerCallback);
 							} catch (Exception e) {
 								explorerPanel.getAsycTreePanel().unmask();
 								new MessageBoxAlert("Error", e.getMessage(), null);
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/util/RequestBuilderWorkspaceValidateItem.java b/src/main/java/org/gcube/portlets/user/workspace/client/util/RequestBuilderWorkspaceValidateItem.java
index 4f023af..2dc9542 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/util/RequestBuilderWorkspaceValidateItem.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/util/RequestBuilderWorkspaceValidateItem.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.portlets.user.workspace.client.util;
 
-import org.gcube.portal.clientcontext.client.GCubeClientContext;
 import org.gcube.portlets.user.workspace.client.AppControllerExplorer;
 import org.gcube.portlets.user.workspace.client.ConstantsExplorer;
 import org.gcube.portlets.user.workspace.client.event.SessionExpiredEvent;
@@ -64,10 +63,6 @@ public class RequestBuilderWorkspaceValidateItem {
 		else
 			httpQueryString +="&"+ConstantsExplorer.VALIDATEITEM+"=true";
 
-		// Add hidden parameters
-		String currentContextId = GCubeClientContext.getCurrentContextId();
-		httpQueryString+="&"+ConstantsExplorer.CONTEXT_ID+"="+currentContextId;
-
 		String urlRequest = servletName+"?"+httpQueryString;
 
 		GWT.log("request builder for: "+urlRequest);
@@ -99,7 +94,7 @@ public class RequestBuilderWorkspaceValidateItem {
 				    }else { //OK STATUS
 
 				    	if(callback!=null)
-				    		callback.onSuccess(new WindowOpenParameter(targetWindow, "", httpQueryString, true, newBrowserWindow));
+				    		callback.onSuccess(new WindowOpenParameter(targetWindow, "", params, true, newBrowserWindow));
 				    }
 			    }