If you use the Fetch FTP client and want to, for instance, edit remote .html files with one application but .css files with another, you can set this up easily: In Fetch, select a .html file and click the Get Info button on the toolbar. In the Get Info window, in the Transfer Option section, choose your desired program from the "Edit files like this with" pop-up menu. Repeat the procedure for a .css file, and you're ready to go!
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From Tonya Engst