updated RFE InitialPath requirements

Author: Marin Bratanov

controls/fileexplorer/server-side-programming/overview.md

@@ -34,7 +34,7 @@ The **RadFileExplorer** control exposes a number or properties that can be used
 |Grid|Telerik.Web.UI.RadGrid|Exposes the embedded RadGrid object|
 |TreeView|Telerik.Web.UI.RadTreeView|Exposes the embedded RadTreeView object|
 |GridContextMenu|Telerik.Web.UI.RadContextMenu|Exposes the embedded Grid's context menu|
-|InitialPath|String|Allows a file or folder to be selected when the RadFileExplorer is loaded. The value set to the property is case sensitive and should be in the same format as shown in the RadFileExplorer's addressbar|
+|InitialPath|String|Allows a file or folder to be selected when the RadFileExplorer is loaded. The value set to the property is case sensitive and should be in the same format as shown in the RadFileExplorer's addressbar. The provided path must point to a concrete file that is present in the currently shown file list.|
 |Splitter|Telerik.Web.UI.RadSplitter|Exposes the embedded RadSplitter object|
 |ToolBar|Telerik.Web.UI.RadToolBar|Exposes the embedded RadTolBar object|
 |ToolBar|Telerik.Web.UI.RadToolTip|Exposes the embedded RadToolTip object|

controls/fileexplorer/troubleshooting/common-issues.md

@@ -18,7 +18,9 @@ Make sure that *UploadPaths* or *DeletePaths* properties are set correctly
 
 ## Setting a path to the InitialPath property does not select folder or file
 
-Make sure that the path set to the property has the same format as the path shown in the RadFileExplorer's address bar
+Make sure that the path set to the property has the same format as the path shown in the RadFileExplorer's address bar. This is required in order to provide unambiguous paths for any content provider.
+
+The provided path must point to a concrete file that is present in the currently shown file list (i.e., in the current folder). If you point the control to a folder that is not yet opened, it cannot navigate to the desired file, because the file list is obtained via a separate request only after the folder is shown to the client, so the control does not know whether the desired file exists yet.
 
 ## An error like "... because the application did not have enough permissions..." occurs only in a production environment. How to debug the issue?