Error Opening files

[deviluc]

Hello, I'm trying to open a file ("garrysmod/models/player/newfile.mdl") which does not exist in order to write content (binary) to it, using following code:

function savePlayerModel(data, filename)
	filename = file.Open("models/player/" .. fileName, "wb", "GAME")
	filename:Write(data)
	filename:Flush()
	filename:Close()
end

file.Open(...) returns nil, even if I use an existing file.
What am I doing wrong?

Edit for future reference:
The error was, that the file must be a .txt file AND it must be written in the data folder.

[James]

You can't write outside of the data directory.

[deviluc]

So, if I would be using "r" as argument#2 file.Open() wouldn't return nil?
And if I would write to the data directory it wouldn't return it either?

[raphy963]

-I was just wrong in general, I just removed it-

[deviluc]

I just modified the code in order to check it if it would be possible to write to the DATA folder:

function savePlayerModel(data, filename)
	print(filename)
	print(file.Exists("e2files", "DATA"))
	
	local modelFile = file.Open("e2files/" .. filename, "wb", "DATA")
	
	modelFile:Write(data)
	modelFile:Flush()
	modelFile:Close()
end

Output is:
policeadm.mdl
true

And modelFile is still nil.
So the error is not the folder and neither that "filename" is nil...