Should be able to open pretty much any file Defold uses for collections, game objects, and components, they are all in the same format.

parser.decodeFile(file)

file = io.open(path, "r")
local data = parser.decodeFile(file, filepath)
file:close()

parser.encodeFile(file, data)

local file = io.open(path, "w")
parser.encodeFile(file, data)
file:close()