Actually I wrote that one and I'm definitely not expert in Lua, hardly know the language.
Anyway, I have no clue if it's a good idea to go opening 1000 files in a row and not closing them (or if opening a new file to the same handle (or whatever) closes the previous one).
That long loop comment means that Lua might not yield during the loop (often enough or at all), which means that if there are 1000 files it could take some time before Lua passes control to to other stuff, which could potentially (such as with the very slow&tiny MMC cards that come with Canon cameras) cause weirdness in some situations.
