Drawing file is not valid

[Anonymous]

I have a whole folder of drawings that if I try to access I get "Drawing file is not valid". 

I have read a bunch of posts and have tried the following:

1. I have tried to insert the drawing into a new blank drawing but nothing happens

2. I have searched all of our drives for BAK and SV$ files and have found none

3. This past summer our team did a clean-up of the drives and deleted all of the BAK files

4. I have tried to copy, send, or print the file and get the same error message

This file contains the base plans for a building we have that is XREFed into our furniture, electrical, security, etc. plans.

Can anyone help me with this?

Thank You!

Paul

[pendean]

Start Windows Notepad.

Drag and drop one of those DWG files into it.

Read the top line's first word: does it save AC10xx (where xx are digits)? If not, they file is dead and gone and is not recoverable. If yes, post the DWG file here and see if someone can open it.