Files with archimedes file extension are some sort of emulator snapshots for Speccy program.
ARCHIMEDES file extension - Speccy ZX Spectrum emulator snapshot
What is archimedes file? How to open archimedes files?
File type specification:
The archimedes file extension is related to a emulator snapshot format created by Speccy ZX Spectrum emulator.
Snapshots are generally used to save the state of program or settings so the user can come load it back.
This archimedes 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.