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Autocad Corrupt/Invalid File?

Hi all,
I am facing an issue that most of our autocad 2007 drawings are getting corrupted or invalid file which accessing it after couple days.

I need your help please.

kuttjad2 years ago

Comprehensive
source:
http://www.filerepairforum.com/forum/cad-tools/cad-tools-aa/dwg/444-%E2%80%8Berror-cannot-open-file-open-cad-drawing-dwg-format
– must be helpful to you, forum contains some interesting thoughts about .dwg
files

If the drawing
file (DWG) still not opens, perform the following steps in the order listed:

Open the drawing
file

Type PURGE at
the command line. With all checkboxes checked on, click Purge All.

Purge Registered
Applications (from the command line):

-Purge

"R"
for Regapps (registered applications), then Enter

"N"
when asked to verify each name to be purged, then Enter

Purge All (from
the command line):

-Purge

"A"
for All, then Enter

"N"
when asked to verify each name to be purged, then Enter

Audit and fix
any errors

Type AUDIT at
the command line

"Y"
for Yes to fix any errors, then Enter

Save the drawing
file

If previous
solutions aren’t helpful to you, try to use DWG Viewer Tool

Demo version:- http://www.dwg.viewertool.com/