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I often use a macro program called Macro Express (http://www.macros.com/) to
automate repetitive tasks such as this. The program allows you to write
simple macros that reproduce mouse movements, mouse clicks, and keyboard
entry. It also provides basic logic, loops, and variables. For example, the
language can
* loop for every file in a directory
* return the full pathname of each file
* execute a Save As command
* select a file format
* type the name of the file in the dialog box
* save the file
* repeat
No affiliation with the company but I have used the product extensively with
good results,