Unable to recover drawing "Drawing file is not valid"

[tim_newsome]

New company files are conglomerate of all things so files are sick.

A couple of times a day Civ3D is crashing and I am not able to recover the recover drawing its generating because the "Drawing file is not valid"

[Ed Jobe]

Sometimes when AutoCAD crashes, the file gets truncated, i.e. the footer is not there. No way to fix it. You have to rely on a previous version, like your bak file.

[Opie]

You might consider creating data shortcuts to civil 3d objects. You could then data reference those objects into other drawings. This would allow you the opportunity to promote that work into a clean drawing. The clean drawing could then be used for design purposes. You could then delete the original data shortcut listed in the Prospector tab of Toolspace and recreate to the clean drawing.

This may help eliminate some of the mess you are working in. Of course, this doesn't help your drawing not valid issues at the moment, but may help moving forward.

[sgariss]

Is the file you have highlighted the file that your tried to recover or the file below it? I would recover the file below it and see if that file is okay. I have not had any luck with a saving a file as recover when C3D crashes, so I do not bother hitting yes. You may also want to take a copy of the bak file and rename it to dwg. Recover that file and see if that works for you if the original file isn't valid.

[NEaton]

Turn on/off levelofdisplay or levelofdisplayoff.
Turn off graphic accelerator.
Run Recover on the backup (change.bak to .dwg) since you won't be able to open the damaged file.
Run -purge regapps to remove any unwanted apps that have attached themselves to the drawing.
Next audit the file and save.
See more in https://knowledge.autodesk.com/suppo...ormance-s.html for more tips on cleaning files.