I use Ultraedit-32 to create and maintain this site. It creates a backup file of any file I edit with the extension .BAK I don't want the .BAK files transferred to my web site. To remove them, I open a command shell in the root directory of my web pages on my PC. There are many subdirectories with potential .BAK under this folder. To delete them recursively:
del *.bak /s
The command tells the command shell to delete all files with a .bak extension in this directory and any subdirectory (/s). I use the same tool to remove unwanted temporary files which have a .tmp extension which are left by windows activity. The folder recursion parameter works for the directory command, so you can use it to find files using the commandline as in