System Variable Turn ON

Here are system variables that you might want to leave turned on.

EDGEMODE- Controls how the TRIM and EXTEND commands determine cutting and boundary edges.
0= Uses the selected edge without any extensions
1= Extends or trims the selected object to an imaginary extension of the cutting or boundary edge

DRAGMODE- When it is on, the image of an object is displayed as you drag it to another position.
0= Does not display an outline of the object as you drag it
1= Displays the outline of the object as you drag it only if you enter drag at the Command prompt after selecting the object to drag
2= Auto; always displays an outline of the object as you drag it

HIGHLIGHT- Controls object highlighting
0= Turns off object selection highlighting
1= Turns on object selection highlighting

FILEDIA- Suppresses display of file navigation dialog boxes.
0= Does not display dialog boxes. You can still request a file dialog box to appear by entering a tilde (~) in response to the command's prompt. The same is true for AutoLISP and ADS functions.
1= Displays dialog boxes. However, if a script or AutoLISP/ObjectARX™ program is active, an ordinary prompt is displayed.

Check Your AutoCAD Version

A quick guide on how to check the version of an AutoCAD file.

If you want to know the version of an AutoCAD file without opening the file itself in the program simply open the file on Notepad and look at the combination of letters and numbers code on the very first line and refer to the list below for the corresponding code equivalent version.

MC0.0   - DWG from Rel. 1.1

AC1.2    - DWG from Rel. 1.2

AC1.4    - DWG from Rel. 1.4

AC1.50  - DWG from Rel. 2.0

AC2.10  - DWG from Rel. 2.10

AC1002 - DWG from Rel. 2.5

AC1003 - DWG from Rel. 2.6

AC1004 - DWG from Rel.9

AC1006 - DWG from Rel.10

AC1009 - DWG from Rel.11/12 (or LT R1/R2)

AC1012 - DWG from Rel.13 (or LT95)

AC1014 - DWG from Rel.14, 14.01 (or LT97/LT98)

AC1015 - DWG from AutoCAD 2000/2000i/2002 (or LT, Map or relative Desktop version)

AC1018 - DWG from AutoCAD 2004/2005/2006 (or other product in the "2004", "2005" or "2006" family)

AC1021 - DWG from AutoCAD 2007/2008/2009 (or other product of the "2007", "2008" and "2009" families)

AC1024 - DWG from AutoCAD 2010/2011/2012 (or other product of the "2010", "2011" and "2012" families)