$ dir <filespec> /select=size=(minimum=XX,maximum=YY)
where filespec is the directory to search
eg.1 - To search for files with size between 1000 and 2000 blocks in a directory
$ dir DKA200:[somedir]*.* /select=size=(minimum=1000,maximum=2000)
eg.2 - To search for files with size between 1000 and 2000 blocks in a directory including
subdirectories
$ dir DKA200:[somedir...]*.* /select=size=(minimum=1000,maximum=2000)