A tto file extension is related to the client access data specification from AS/400 Server.
TTO file extension - Client access data specification
What is tto file? How to open tto files?
File type specification:
The tto file extension is associated with files used for AS/400 Server (Application System/400), developed by IBM in 1988.
The tto file stores access data specification.
Most likely some old format without support. No further information could be found.
This tto file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.