Shane’s article ADDING APPLESCRIPTOBJC TO EXISTING SCRIPTS employs the conceit that you may want to add ASObjC code to an existing non-ASObjC script containing loads of file specifiers and you don’t have time to go through changing them all to «class furl» coercions.
If you do have more time, you may be able save some of it by using the following regex in Script Debugger’s “Find” field (with the “RegEx” box checked, of course):
This matches the word ‘file’ followed by anything which could be a variable label, text in double-quotes, or a parenthesised expression up to three levels deep.
The corresponding replacement string would be:
($1 as «class furl»)
In use, it’s better to step through finds using “Replace & Find” than to hit “Replace All”, since you could easily end up doing peculiar things to comments or application references: