Files with dlis file extension are data files in Digital Log Interchange Standard format.
DLIS file extension - Digital Log Interchange Standard format
What is dlis file? How to open dlis files?
File type specification:
The dlis file extension is exclusively used for files in Digital Log Interchange Standard format used to storing data on 9-track tapes.
Seems to be obsolete file format without support from developer.
This dlis 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.