Files with iot file extension can be found as Hitachi Ladder Editor IO comments.
IOT file extension - Hitachi Ladder Editor IO comment
What is iot file? How to open iot files?
File type specification:
The iot file extension seems to be related to a specialized file type used by a ladder programming tool for Hitachi PLCs.
Most likely some old format without support. No further information could be found.
This iot 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.