How to Load Lisp File in AutoCAD LT 2020?

Loading a LISP File in AutoCAD LT 2020: Step-by-Step Guide

Understanding LISP Compatibility in AutoCAD LT

AutoCAD LT does not support LISP programming or the APPLOAD command. If you’re looking to use LISP scripts, it’s essential to know that LISP functions are reserved for the full version of AutoCAD. Therefore, loading LISP files is not applicable in AutoCAD LT.

How to Load a LISP File in AutoCAD

If you are using the full version of AutoCAD (2025), you can follow this procedure to load a LISP file.

1. Access the CUI Command

   • Start by typing CUI in the command line and pressing Enter. This opens the Customize User Interface dialog.

2. Select the CUI File

   • In the dialog that appears, locate and select ‘acad.cuix’ or any custom CUI file you wish to modify.

3. Navigate to LISP Files Section

   • Within the CUI dialog, look for the section dedicated to LISP files. You may need to expand categories to find it.

4. Right-Click to Load LISP

   • Right-click on the LISP files section. A context menu will pop up.

5. Choose Load LISP Option

   • Click on “Load LISP” from the context menu. This will prompt a file selection window.

6. Locate and Select Your LISP File

   • Browse through your directories to find the LISP file you intend to load. Click on it to highlight, then select ‘Open.’
7. Finalize Changes
   • After the file is selected, click the “Apply” button to save your changes. Once done, you can close the CUI dialog.

Downloading a LISP File for AutoCAD

If you need to obtain a LISP file, follow these steps:

1. Download the File

   • Right-click on the desired LISP file link and choose the “Save link as…” option to download it to your computer.

2. Rename File Extension

   • Ensure the file has a .lsp extension if it doesn’t already. This is the required format for LISP files in AutoCAD.

3. Open AutoCAD

   • Launch AutoCAD on your computer.

4. Use the APPLOAD Command

   • Type AP (for APPLOAD) in the command line and hit Enter.

5. Select and Load Your LISP File

   • Navigate to the location where you downloaded the file, select it, and click ‘Load’ to integrate it into your session.

6. Close the Dialog

   • After loading, click “Close” to exit the APPLOAD dialog.
7. Run Your LISP Routine
   • If needed, execute your LISP routine by entering its name at the command line.

Understanding AutoCAD vs. AutoCAD LT

AutoCAD and AutoCAD LT serve different needs. While both versions incorporate essential core functions, AutoCAD includes advanced features for 3D modeling and automation, making it suitable for users requiring detailed drafting capabilities. In contrast, AutoCAD LT is strictly focused on 2D drafting, rendering it a more economical option for basic design work.

What is AutoLISP?

AutoLISP is a programming language specifically designed for use with AutoCAD. It allows users to automate repetitive tasks, customize commands, and create dynamic drawings, but the capability is exclusive to the full version of AutoCAD.

FAQ

1. Can I use LISP in AutoCAD LT?
No, AutoCAD LT does not support LISP programming or the APPLOAD command, which is used to load LISP files.

2. What is the file extension for LISP files in AutoCAD?
LISP files typically use the .lsp file extension, while compiled AutoLISP files have the .fas extension.

3. How can I create a LISP file?
To create a LISP file, open a text editor, write your LISP code, and save the file with a .lsp extension. Afterwards, you can load it in AutoCAD using the CUI or APPLOAD commands.