Another way to create a script (.bat file) if you have a lot of files is to start with a list of filenames and turn them into commands using a spreadsheet and/or text editor.

For example this windows command
dir *.flac /b > filelist.csv
will create a text file called 'filelist.csv' containing a list of the flac files. Make it a csv file so that you can load it into a spreadsheet.

In the spreadsheet turn each row into a command, save the csv, remove the commas, and rename to .bat