LANDFIRE - multi-partner wildland fire, ecosystem, and wildland fuel mapping project
[Skip to Content] [Skip to Content]

Get Data link
Homepage » Frequently Asked Questions (FAQs)

Frequently Asked Questions (FAQs)

Q.  I installed LFDAT 2.x on Windows 7 or 10 and I am getting an error message in the "Check for Updates" option and the download option does not work. What can I do to fix it?

For "Check for Updates", you can get any of these error messages: (1) Component `MSCOMCTL.OCX` or one of its dependencies not correctly registered: a files is missing or invalid; or (2) Out of Memory.

Also, from the download option, after drawing a rectangle in the area of interest, nothing happens.

These two problems occur because LFDAT requires an ActiveX control for Visual Basic 6 (MSCOMCTL.OCX) on Windows 7 and 10.

Steps to register MSCOMCTL.OCX on Windows 7 or 10 64-bit version (it requires administrative privileges on the system) (source: Microsoft Community):

  1. Check if the OCX file already exists on %windir%\SysWOW64 (e.g. c:\Windows\SysWOW64, assuming Windows is installed in the Windows folder on your C drive)
  2. If the file exists, go to step 5.
  3. If it does not exist, download the OCX file to your desktop or someplace you can find it. If the file downloads as a .txt file, rename file from extension *.txt to *.ocx.
  4. Copy the file on the SysWOW64 folder (SysWOW64 means "Windows on Windows" and it is where Windows keeps 32-bit version files on a 64-bit system)
  5. Open a Command Prompt window as Administrator.
  6. For Windows, upper and lower case letters do not matter when working in the Command Prompt window.
  7. For a 64-bit installation enter the following command: cd %windir%\SysWOW64
  8. Then enter the following command: regsvr32 MSCOMCTL.OCX
  9. If the command from step 8 does not work try this one: regsvr32 C:\Windows\SysWOW64\MSCOMCTL.OCX
  10. You should see a message like this: DllRegisterServer in MSCOMCTL.OCX succeeded.


To view and print a PDF you must obtain and install the Acrobat® Reader, available at no charge from Adobe Systems.
*DOI and USGS link and privacy policies apply.
Looking for something: Site Map   /   Search
Page Contact Information: LF Helpdesk
*Users may experience intermittent service Thursday evenings due to routine maintenance.