What other files?
"HTTP files" are not really a thing! You serve data (files) via HTTP.
To serve "data" from Node-RED you typically use the http-in and http-out nodes. If you want the data that is transmitted to be loaded from a file then simply put a file node between the http-in and http-out. That file can be anywhere (FS permissions permitting)
For example: Download a file from node-red using standard nodes (flow) - Node-RED
Alternatively, you can serve files from by configuring httpStatic - again this can be anywhere (permissions permitting)
Please try to explain a little clearer
