My office has project files that date back to the late 1990's and early 2000's.
Prior tro my coming on board, they were using AutoCAD release 10 (DOS) i believe.
Since that time, my office has upgraded and gotten on subscription with AutoDesk.
The issue I am having is that a project that was last opened in 2002 has come back up for further work on the site. To try to minimise the amount of drafting to be done, it would be good to be able to open the old files.
When I try to do so I get the AutoCAD Message "Drawing file is not valid."
I have tried to open numerous files in the project and i get the same message.
RECOVER doe not work, I get the same message.
Can anyone help me?
Not sure if this will help you but I have just looked out some of our old files going back to the mid 90's & all of them opened with no problem. I have opened them using MEP 2013 with both the mep & vanilla profiles.
Were they definatly created/saved in auotcad? If you open a file with windows notepad the first (probabaly 6) characters will tell you what version they were last saved in, for example Auotcad R14 was AC1014. One I opened was AC1009 which I think meant it was Autocad R9
Hope you are able to resolve it.
How were the files stored for the past few decades? 1990's suggest 5-1/4, possibky 3-1/2 floppy disks. If the compnay was really up to date back when, maybe CD-R? none of which are archival media available to reliable store digital files long term, if magnetic, then the fluorescent lights will eventually erase them. if phase-chane CD-R, then the instability of the chemicals used will degrade.
most likely the files are simply corrupt. It's unlikely to be an Acad version issue, although you could test by trying to open in BricsCAD or some other app that can handle dwg formats.
How and where are these files stored? How were the recovered? Off a tape backup by chance?
Open one of these files in Windows Notepad, and read the header: what does it say?
File corruption has a lot more to do with how it was stored and restored/handled than whether v10 for DOS touched it last or not.
All files have been on the server over this time.
Ther server has been upgraded serveral times since these drawings have been worked on.
We also have data tapes for the back-up.
We have tried the files from the data tape back-ups, to no avail.
will look into BricsCAD now
Is this from the same site you are at now?
I'm wondering if it may have something to do with this link:
Did you have any custom objects?
Good luck with this problem.
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