.#01 is Numbered picture
Key Features: .#01 File Extension
What is an .#01 file?
The #01 file extension is used as a method of numbering photos scanned from camera film.
The #01 file stores picture image, or photo. Other photos from the film are countered as #02, #03, #04...#xx etc.
This #01 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.