About Saving Drawings to Previous Drawing File Formats
You can save a drawing in a format compatible with previous versions of the product.
You can save a drawing created with the current release of the program in a format
compatible with previous versions. This process creates a drawing with information
specific to the current release stripped out or converted to another object type.
If you use the current release to open a drawing created with a previous release,
and you do not add any information specific to the current release, you can then save
the drawing in the format of the previous release without loss of data.
the AutoCAD R12/LT2 DXF option.
If you need to keep a drawing created in a previous release in its original format,
either mark the file as read-only, or open it in the current release and use the File
Type options in the Save As dialog box to save it in its original format.
Because saving a drawing in an earlier release format may cause some data loss, be
sure to assign a different name to avoid overwriting the current drawing. If you overwrite
the current drawing, you can restore the overwritten version from the backup file
(filename.bak) that is created during the saving process.
Maintain Associativity in Dimensions
Associative dimensions created in AutoCAD 2002 or later generally maintain their
associativity when saved to a previous release and then reopened in the current release.
However, if you modify dimensioned objects using a previous release to the extent
that new objects are formed, the dimension associations change when the drawing is
loaded into the current release. For example, if a line that was dimensioned is trimmed
so that an interior portion of the line is removed, two line objects result and the
associated dimension applies to only one of the line objects.
Dimension associativity is not maintained when a drawing is saved as an AutoCAD R12/LT
2 DXF file and then reopened in the current release.
Save Drawings with Large Objects
Drawings saved to a legacy drawing file format (AutoCAD 2007 or AutoCAD LT 2007 or
earlier) do not support objects greater than 256MB.
Limitations of Saving to Earlier Versions
Saving a drawing containing model documentation drawing views in Release 2012 format
has the following limitation:
- Although drawing views display and list correctly, none of the editing commands (with
the exception of the MOVE command) work on the drawing views.NOTE:Drawing views created by a newer version of AutoCAD cannot be edited by an older version
of AutoCAD. For example, drawing views saved by AutoCAD 2014 cannot be edited in AutoCAD
2013, even though both versions of AutoCAD use the AutoCAD 2013 file format.
Saving a drawing in Release 2000/LT 2000 format is subject to the following limitations:
- File size can increase.
- Encryption and digital signatures are not preserved.
Saving a drawing in Release 14/LT 98/LT 97 format is subject to the following limitations:
- Hyperlinks are converted to Release 14/LT 98/LT 97 attached URLs.
- Database links and freestanding labels are converted to Release 14/LT 98/LT 97 links
and displayable attributes.
- Database attached labels are converted to multiline text and leader objects, and their
link information is not available. Attached labels are restored if you open the drawing
in AutoCAD 2000 or later.
- Dynamic block geometry can be redefined independent of the blockâ€™s dynamic elements,
and the geometry in the block reference is not updated when the drawing is opened.
- Dimensions created using the DIMARC and DIMJOGGED commands may not retain their original
color in Release 14/LT 98/LT 97.
Saving a drawing in Release 12/LT 2 DXF format is subject to the following limitations:
- Lightweight polylines and hatch patterns are converted to Release 12 polylines and
- All solids, bodies, regions, ellipses, leaders, multilines, rays, tolerances, and
xlines are converted to lines, arcs, and circles as appropriate.
- Groups, complex linetypes, OLE objects, and preview images are not displayed.
- Many objects are lost if you save a drawing as Release 12 and open it in Release 2000/LT
2000 or later.
- Multiple layouts and layout names are lost. Only the Model tab and the current layout
tab are saved.
- Spaces in the names of layers and other objects are converted to underscores, and
their maximum length is 32 characters.
- DWF or DWFx underlay files attached to drawings cannot be saved to Release 12/LT 2
- The status of external references as unloaded is lost.
NOTE:This does not apply to AutoCAD LT.
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