problem in me?
I found the old figures on my ancient hard drive, AUTOCAD18.0 was set there, but now I have a latest version, namely AUTOCAD 22.0, and I with surprise found out that I could not open this document. Writes an error: the DWG file hangs up or AutoCAD falls. How you think that it is connected to different versions of programs or a problem in me?
You could try this. Follow this link to https://www.3ds.com/products-services/draftsight-cad-software/free-download/ where you can download for free Draftsight, an AutoCad clone and install on your computer. Then see if it will open your drawing. I use it to open dwg and dxf files when I need to. Has worked with all of the files from all versions of AutoCad that I have tried it with. Use the "recover" option if your file may be corrupted.
From one of the sources about AutoCAD
Using RECOVER command you can recover as much data as possible from AutoCAD files with DWG, DWT and DWS extension. This command can be used for files which are damaged to such an extent that it cant even be opened by AutoCAD.
Open a blank drawing and type RECOVER on command line press enter it will open file browser select drawing which is damaged and click open. AutoCAD will attempt to recover as much data as possible from that drawing and it will open recovered drawing in a new tab of same AutoCAD window.
Moreover, in case it isn't help to restore dwg. I usually use Google, I found following for your case