What is a LSP file?
The .LSP file extension is most commonly associated with AutoLISP Source Code files. AutoCAD uses these files to store custom macros, commands, and scripts that automate repetitive drafting tasks. These files contain plain text code written in AutoLISP, a customized dialect of the standard LISP programming language created by Autodesk.
Because .LSP is a broad extension, it also represents several other file formats. These include List & Label report layouts or printer setups by combit, car physics data in racing games like DiRT Rally 2.0, ZIP-compressed LEGO StoryStarter projects, and 3D point cloud data for software like Leica Cyclone.
How to open LSP files?
You can easily open standard AutoLISP files with any basic text editor, such as Notepad on Windows or TextEdit on Mac, to read or modify the source code. To execute the code, you must load the file directly inside AutoCAD using the `APPLOAD` command. However, if your .LSP file is a compiled Capcom game script, a 3D point cloud, or a LEGO project archive, opening it in a text editor will display unreadable characters.
Inspect and analyze LSP files online
Because an .LSP file can have multiple meanings, viewer.online/lsp can analyze .LSP files to identify the exact format and creator software. You can use it to inspect the file structure, extract readable text, and check whether an online preview is available.
If you need to use the data in a different program, we recommend file conversion to sensible target formats on convert.guru. For example, you can convert text-based .LSP scripts into standard .TXT or .MD files for easier sharing.
Summary
viewer.online/lsp is useful for identifying, inspecting, and understanding .LSP files without installing software or dealing with compatibility problems. Whether you have a CAD script or a mysterious game file, it helps you view the contents safely.