you have to change the time stamp for the files or folders individually, the files you added first will always appear on the bottom for the files that you add. (with Ark on 3.55 I simply used the file manager that was installed with it). Best thing to do now is to add your files in naming order from - "Z" to "A" - when you ftp them over to your vita on henkaku, not sure about file managers on henkaku.