how to delete files with rest web services

Question

services version 7.x-3.1 drupal version 7.12

I upload file in Base64 encoding with rest services

resource_path: file.json

how can i delete file with rest services?
i now how to delete node

resource_path:node/nid.json, resource_type:DELETE

i test

resource_path:file/fid.json, resource_type:DELETE

but receive 404!