In Perforce, you can change the filetype of files stored in the depot either by:
The new filetype takes effect when you submit your opened files to the depot. (See Filetypes for a list of Perforce filetypes.)
Selecting Change filetype... from the Action menu brings up a form that lets you enter a new filetype and reopen your opened files using that filetype. If you chose Change filetype... with a directory selected, the form enables you to select the files on which the Reopen command operates. See Restricting Files Used in Commands for more information.