if you export with Cordova,I think that you need cordova-plugin-file
you can find plugins for C2.. here
[quote:2us5rmyc]Cordova File: read, write file, append file, remove file, copy file, move file, get directory entries and create directory.
[android, blackberry10, ios, windows8, wp8] [cordova cli] [xdk] [cocoon] [phonegap build service]
...but I may be wrong..so to find a second opinion before you buy anything.