[python-win32] pywin32 programming error on Win7 with shell.SHGetDesktopFolder, desktop.BindToObject, desktop.GetDisplayNameOf

[iMath]

When running the following code on WinXP , all is fine , 
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from win32com.shell import shell 

def launch_file_explorer(path, files): 

    folder_pidl = shell.SHILCreateFromPath(path,0)[0] 
    desktop = shell.SHGetDesktopFolder() 
    shell_folder = desktop.BindToObject(folder_pidl, None,shell.IID_IShellFolder) 
    name_to_item_mapping = dict([(desktop.GetDisplayNameOf(item, 0), item) for item in shell_folder]) 
    to_show = [] 
    for file in files: 
        if file not in name_to_item_mapping: 
            raise Exception('File: "{}" not found in "{}"'.format(file, path)) 
        to_show.append(name_to_item_mapping[file]) 
    shell.SHOpenFolderAndSelectItems(folder_pidl, to_show, 0) 
import os 


p=r'E:\aa' 
print(os.listdir(p)) 
launch_file_explorer(p, os.listdir(p)) 
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however ,when tested on Win7,I got the following error 

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['b1', 'b2', 't.txt'] 
Traceback (most recent call last): 
  File "D:\g.py", line 21, in <module> 
    launch_file_explorer(p, os.listdir(p)) 
  File "D:\g.py", line 13, in launch_file_explorer 
    raise Exception('File: "{}" not found in "{}"'.format(file, path)) 
Exception: File: "t.txt" not found in "E:\aa" 
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I nearly have no experience on pywin32 programming ,the above code is googled,anyone can help me fix this error ?thanks in advance !
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