This was your original selector,
< wnd app=‘acrord32.exe’ cls=‘AcrobatSDIWindow’ title=‘Unsaved-Account Statement Details Report.pdf - Adobe Acrobat Rea*’ />
you can make it dynamic as,
< wnd app=‘acrord32.exe’ cls=‘AcrobatSDIWindow’ title=‘“+item.Substring(item.LastIndexOf(”")+1) +" - Adobe Acrobat Rea*’ />
Here item is the variable which you get from For Each File Loop
item.Substring(item.LastIndexOf("")+1) will extract only the filename from full file path