Manual OpenDCL Installation
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Manual OpenDCL Installation


You need to download the latest version of the OpenDCL library.


You may have received one of the following error messages:

  • The library is out of date
  • The helper library is out of date
  • Error: 'no function definition: dcl-form-show'



Many of our dialog boxes use a library called OpenDCL to enable special features such as a Web browser control, image viewer, and a grid control.


This library is included in our Workstation Installer, yet it's updated periodically, which may require you to install the latest version.


You might also need to install OpenDCL manually because your LandFX folder is on a shared online folder and is not keeping a local copy.





1. Close CAD.



2. Open the Windows Control Panel, and click Uninstall a program.

Control Panel, Uninstall a Program option




Programs and Features dialog box, OpenDCL Runtime option, Uninstall button

3. Select OpenDCL Runtime, and click Uninstall to uninstall OpenDCL Runtime.

If OpenDCL Runtime fails to uninstall, use the Microsoft Fixit tool.




4. Download the latest library using the link below. Save the file to your desktop.



5. Once the download has completed, find the file on your desktop (or another location where you might have downloaded it, such as your Downloads folder).



6. Right-click the downloaded file, and select Install from the menu.

Error Message: The signature of this program is corrupt or invalid

If you downloaded OpenDCL using Internet Explorer, you might see a warning that The signature of this program is corrupt or invalid. If so, right-click within the area pictured below.


View Downloads - Internet Explorer dialog box, The signature of this program is corrupt or invalid message



To complete the installation, you can then select Run anyway or Install anyway (or a similar option) from the menu that opens.


Run anyway menu option



7. After the installation completes, restart your computer.

Restarting your computer at this point will allow for the proper completion of the installation process.



8. Open CAD, then open our Detail Explorer tool.


If the Detail Explorer dialog box comes up, you've installed OpenDCL successfully.


Getting an error when opening CAD or attempting to open the Detail Explorer? Read on.


Potential errors or other messages:

Security Warning

If you receive a security warning, click Load to allow AutoCAD to use OpenDCL.


Unknown Command or "Arxload Failed" Message

If the Command line reads UNKNOWN COMMAND, or if you receive an error message saying "Arxload failed: C:\Program Files (x86)\Common Files\OpenDCL\OpenDCL.x64.19.arx," you'll need to change your security settings.


1. Follow our steps to configure your Security Options from within the System tab of the Options dialog box.


2. Type MENULOAD in the Command line and press Enter.


3. Follow our steps to unload and reload the Land F/X menus.


4. Land F/X and OpenDCL should now be loaded correctly. To test whether OpenDCL is installed correctly, open our Detail Explorer tool.


If the Detail Explorer dialog box comes up, you've installed OpenDCL successfully.

Don't see your Land F/X menus, or are the Land F/X tools not working? Download and run our latest Workstation installer.

Last modified on May 11, 2022


  • Land F/X

Our software tailors AutoCAD® to the needs of landscape architects, irrigation designers, and other professionals. We automate your most tedious tasks and ensure accuracy, giving you more time to design.

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