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Start
by verifying that the drawing file you are trying to open was not created in a
newer version of AutoCAD, with a newer file format than the version you are
currently using. For example, a drawing created in AutoCAD 2015 will not
open in AutoCAD 2012. Refer to http://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/AutoCAD-drawing-file-format.html" rel="nofollow - for specific details on the file formats
supported by various AutoCAD releases. If this turns out to be the
issue, request that the drawing be saved to a version that is compatible
with the AutoCAD you are using.
Otherwise, this message indicates that the
drawing file has been damaged beyond use. However, there are a few things
that may get it to open:
Try
to open the drawing file directly instead of using the Recent Documents menu.
Check
that the storage location that holds the drawing is working properly.
Use
the RECOVER and RECOVERALL commands on the drawing.
Attempt to insert the damaged file into a clean drawing or template
using the INSERT command.Also i can suggest to use online service http://onlinefilerepair.com/en/autocad-repair-online.html" rel="nofollow - https://onlinefilerepair.com/en/autocad-repair-online.html When none of the above work,
try to locate a backup file (.bak) or the latest
automatic save file (.sv$) for the drawing, or recover the file from
another computer or from a file backup system that you may have in place to
help manage your files. The AutoCAD backup file is usually found in the
same folder as the DWG. The auto-save file is located in your user temp folder.
Any easy way to open this up is to type %tmp% in the location bar of any folder
window or in the search field within the Start menu. Rename the .bak or .sv$ extension to .dwg and then you should have
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