Rhino 6 File not being recognised as a Rhino m_archive

Hi there, new to these forums and to using Rhino.

My files have recently started returning this error when trying to open them.

Opening Rhino 6 in Safe Mode and running the Rescue3dmFile command are both failing to return any results for these files.

Just wondering if anyone has any advice to help recover these files if at all possible as currently I can’t even recover the basic geometry for these designs.

Can attach images of the error pop up if necessary.

Hello- what does Audit3dmFile have to say, anything? Are the files saved to a local hard drive? If possible please zip and upload one to www.rhino3d.com/upload to my attention, along with a link to this thread.