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partially open drawing does not already contain spatial and layer indexes, this
option is not available.
None
Creates neither layer nor spatial indexes when you save a drawing.
Layer
Loads only layers that are on and thawed.
Spatial
Loads only the portion of the drawing within a clipped boundary.
Layer & Spatial
Optimizes performance by specifying that the program loads only layers
that are on, thawed, and within a clipped boundary area.
Save All Drawings As
Specifies the default file format that drawings are saved to. If you change the
specified value, all subsequent uses of SAVE and QSAVE save the drawing to
the new file format. You can also set this option on the Open and Save tab in
the Options dialog box (see OPTIONS). Set the Save As option to AutoCAD
2004 Drawing to optimize performance while saving.
DXF Options Tab (Saveas Options Dialog Box)
Sets drawing interchange file output options.
Format
Specifies whether the program creates an ASCII or a binary DXF file.
ASCII-format DXF files can be read with a text editor and are compatible
with a wider range of applications. Binary-format DXF files contain all of
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