thanks, I found out the reason： this question has no relationship with Win7
or WinXP,but related to the users' system setting .
GetDisplayNameOf() only gives the DISPLAY name ,so the filename with or
without extension acording to whether the user want to view files in the
explorer with extension .
my settings is that filename with extension on WinXP but not on Win7,while
os.listdir() returns filenames with extension on both of them ,this caused my
problem here .
so anyone know how to fix my problem ? I mainly want to use
shell.SHOpenFolderAndSelectItems() here.
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