Don't see telnet.exe in system('dir c:\Windows\system32\') 32-bit matlab on 64-bit machine

In a 64-bit machine running matlab 32-bit

>> ls c:\Widnows\system32\telnet.exe
>> system('dir c:\Windows\system32\telnet.exe')

Both don't find the file

also the file list given by 'ls' and 'dir' are quite different from What I get in explorer for system32 folder.

If I copy the telnet.exe to local folder, both command can find it.

In the same 64-bit machine running matlab 64-bit

>> ls c:\Windows\system32\telnet.exe

can find the file

Is it a windows trick or something else?