Not Valid-Not version related

Hello all,

Got the error message "Drawing File is not Valid"

Read some forums about this topic and found alot of these are related to someone sending a drawing from a different version. Here's the kicker, I'm the creator of the drawing.

Started the drawing, worked on it for 9 days or so, then came in this morning to open it and that error popped up. Went into some other drawings that I've saved and I was able to open all those. I saved this one the same way I always do. Not following what I'm doing it wrong, and really don't want to start over on this thing.

Any help would be greatly appreciated.

Thanks

Also, when I go to file, open, and I click on the file, the correct drawing pops up in the preview window

have you tried recover?

Sounds like a corrupted drawing. Follow advice given above.

Do you have AutoCAD set up to create bak files with every save?

Tried recover, no go.

Do have a Bak. file but when I try to open it, I also get the same error message

Did you rename the bak file to dwg first?

haha, no I did not.

Just did it and it's open now.

Thanks for everyone who responded. Saved me alot of time redrawing.

thanks again all!!!!!!!!!

You're entirely welcomed. I'd run a AUDIT on the file to see if there are any errors contained within. I'd also save every 10 minutes and maybe even place a backup copy on a flashdrive or a CD for safe keeping.

Ran audit, it corrected all my errors, thanks for advice on that.

Just finished saving in two other locations.

Since I am a newbie with Autocad, how often to you reccomend running the audit? every so often throughout the drawing or just before saving or when?

thanks