Alternative Updates

[MegaMasterX90875]

I'm working on a server and I've come up with an idea to keep from overwriting files (using GS2, I"VE FINALLY MIGRATED TO GS2!!)
This example uses the file test.txt in the levels folder.
Can't I use

NPC Code:

---

function onCreated&&Fileexists(levels/test.txt)

{

   selectfilefordownload(levels/test.txt);

} 

---

Not sure, but the idea checks the player's graal folder for the file before downloading it to the client. Also, should I put this Clientside?