http://dl.qj.net/nintendo-ds/homebrew-applications/txtwriter-v03.html Book mark that site, there might also be other ones if that doesn't do it for you. Best homebrew site
yes i have downloaded the txtwriter form that site..i created some txt and save it from my ds, but when i put it on my laptop i can't find the txt file..
That's not the app's fault, you gotta know how the folders are set via the program. I bet I could find it if I used this, just work out where the app is, check there, and search all around, and use the pc's search function while browsing the sd card.