And where it should be stored??B4X:File.WriteString(File.DirInternal, "1.txt", "texto")
Ok,The emulator doesn't work with Windows file system. It has its own internal file system.
You can use ddms tool to access the emulator files.
Did you have a look at following chapters in the Beginner's Guide ?
14 Basic Language / 14.10 Files
6. Emulator / 6.4 Exchanging files with the PC