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In the process of drawing drawings using Haochen CAD drawing software, we often encounter a problem: The CAD drawing file I got was very large, but after opening it, there was very little content on the drawing. Why does this abnormal increase in CAD drawing files occur? How to solve this problem after encountering it? Next, let me introduce it to you in detail! Reasons why CAD drawing files increase abnormally: It is mainly a CAD bug. Copying and pasting from DWG containing DGN line types will cause the DWG file to increase in size. Most of these data are unnecessary data. File bloat issues that occur when copying/pasting objects in the same drawing from one file to another, or when attaching drawings using DGN linetypes to other files as external references. DGN is a file format. Related software is likely to be used in the process of drawing general architectural drawings. However, in the process of cross-referencing, these useless data exist in DWG and are invisible, which brings great difficulties to cleaning and management. Solutions to abnormally large CAD drawing files: 1. Download the following patches for repair. 2. Patch installation instructions: 1) Close all software applications. 2) Download the patch to a location on your local computer. 3) Double-click the ZIP executable file and extract the files to your computer. 4) Find AcDgnLS.dbx in the product installation folder and rename the file to AcDgnLS.bak . 5) Copy the files extracted from step 3 to the product installation folder. 3. Steps to execute the cleaning tool: 1) Start Haochen CAD. 2) Run the NETLOAD command and browse to DgnLsPurge.dll (One of the files copied from step 5 above). If you are loading DgnLsPurge.dll If you encounter a problem, check the properties of the .dll file by selecting the file, right-clicking the file, and then selecting Properties. In some cases, your system's security settings may prevent the .dll from loading. If this is the case, you can unblock the .dll by selecting "Unblock" in the Security section of the properties. 3) Open the affected graphics file. 4) Run the DGNPURGE command so that the primitives can be cleared. 5) Run the PURGE command for all unused objects. 6) If necessary, repeat steps 4-5. 7) Save the DWG. 8) Repeat steps 3-7 for other affected files. Things to note: 1. Although saving DXF as a separate file can solve some problems, data is very likely to be lost in the process, so please use it with caution! 2. After closing CAD, the DGNPURGE command will not remain loaded on the system. If you need to use this command in future tasks in CAD, you need to reload it by using the NETLOAD command again. DGNLsPurge.dll . 3. Steps to uninstall this patch 1) In the product installation folder, delete the patch file you downloaded. 2) will AcDgnLS.bak The file is renamed AcDgnLS.dbx. The above is the process of drawing drawings using Haochen CAD drawing software. When the CAD drawing file increases abnormally, you can refer to the above method to solve the problem. I hope it can help everyone.