In the documentation for Files (core), there seems to be a small typo in the TextReader section, under ReadLine:
I believe InternalDir is wrong and should say DirInternal instead:
B4X:
Reader.Initialize(File.OpenInput(File.InternalDir, "1.txt"))
I believe InternalDir is wrong and should say DirInternal instead:
B4X:
Reader.Initialize(File.OpenInput(File.DirInternal, "1.txt"))