In an effort to understand what you want, here is an example batch file:
DIR G:\Structural /S /B
G:\Structural\cad2012.dwg
G:\Structural\cad2013.dwg
G:\Structural\cad2014.dwg
G:\Structural\photo2012.jpg
If you just want to find the files with 2012
DIR G:\Structural /S /B | FINDSTR 2012
G:\Structural\cad2012.dwg
G:\Structural\photo2012.jpg
If you just want to find the dwg files from 2012
DIR G:\Structural /S /B | FINDSTR 2012 | FINDSTR /R /I dwg$
G:\Structural\cad2012.dwg