Hi,
Why are you traing to use that button?
It's much easier to use simple 
its called "Local file" u can grab it by shortcut CTRL+SHIFT+f9...
Another option is to use SAP functions:: put "%PC" to command field then enter, and you will get the window with option to save data in excel.
Please find below some examples to download data to excel:
'For STANDARD T-CODES like MB52
'-----------------------------------------------------------------------------------------------
'export to excel button
Session.FindById("wnd[0]/tbar[1]/btn[45]").Press
Session.FindById("wnd[1]/usr/subSUBSCREEN_STEPLOOP:SAPLSPO5:0150/sub:SAPLSPO5:0150/radSPOPLI-SELFLAG[1,0]").Select
Session.FindById("wnd[1]/tbar[0]/btn[0]").Press
Uname = CreateObject("WScript.Network").UserName
Session.FindById("wnd[1]/usr/ctxtDY_PATH").Text = "C:\Users\" & uname & "\Desktop\"
Session.FindById("wnd[1]/usr/ctxtDY_FILENAME").Text = "TEMP.xls"
'rewrite
Session.FindById("wnd[1]/tbar[0]/btn[11]").Press
OPTION WITH "%PC"
'-----------------------------------------------------------------------------------------------
'save to TEMP
session.findById("wnd[0]/tbar[0]/okcd").Text = "%pc"
session.findById("wnd[0]").sendVKey 0
session.findById("wnd[1]/usr/subSUBSCREEN_STEPLOOP:SAPLSPO5:0150/sub:SAPLSPO5:0150/radSPOPLI-SELFLAG[1,0]").Select
session.findById("wnd[1]/tbar[0]/btn[0]").press
session.findById("wnd[1]/usr/ctxtDY_PATH").Text = "C:\Users\" & Uname & "\Desktop\"
session.findById("wnd[1]/usr/ctxtDY_FILENAME").Text = "TEMP.xls"
session.findById("wnd[1]/tbar[0]/btn[11]").press
Best,