free system scan

Select Operating System

  • Identifies file type
  • Associates file extensions
  • Monitors associations
  • Helps open files


File Extension UL

What is File Extension UL?

File Extension UL Recommendation:

Run a Free Scan to check for File Extension UL related errors & to optimize PC performance.

File Extension UL Description:

The Windows Update Downloader (WUD) is a third party utility, which provides information for Windows installations and customizations that are unattended. It allows you to download all the latest Windows updates and integrate them into one single interface. All of these updates are contained in the Update Lists stored in files with the .ul file extension.

Files with the .ul file extension contain the necessary list of updates for each version of Windows such as Windows 2000, Windows 2003 Server, Windows XP, and Windows Vista. There are also files with the .ul file extension for Microsoft Office 2003 and Microsoft Exchange 2003. Once the download of these files are complete, they can be simply included into your Windows source by using some popular utilities like nLite.

Files with the .ul file extension are also available for programs other than Windows so that system administrators, tweakers and other power users can be assisted with their network deployments, accelerate their unattended installs, and their service packs be automatically updated.

The downloaded files with the .ul file extension come in compressed format with their file extension changed to the ULZ file extension. Once downloaded, they can be extracted and saved in the WUD program directory with their file extension back to the UL file extension. Simply open the files with the .ul file extension and they can be automatically installed.

However, in order to use the files with the .ul file extension, they must be in the same folder as the WUD directory. This is because WUD incorporate itself in the Windows shell to simplify the installation of these files. After WUD's installation and first run, all downloaded files with the .ul file extension automatically install themselves in the WUD's program folder.

The file with the .ul file extension typically contains article property, which can be navigated by WUD when the URL is provided within the file. It can also be automatically refreshed and arranged in the pop-down group of WUD.


Jean Sebastien Carle

Author URL:

Applications associated with file extension UL:

Windows Update Downloader

Common Path:

C:\ Program Files

free system scan

Select Operating System


Browse By Name: