Steam.exe (main exception) unable to load library steamUI.dll

April 2018


Upon launching Steam, an error window appears saying:
Steam.exe(main exception) : unable to load library steam.dll


  • Find the following file: ClientRegistry.blob, in the Steam installation folder.
  • Delete it, then restart your PC.
Published by aakai1056. Latest update on May 20, 2013 at 11:21 AM by jak58.
This document, titled "Steam.exe (main exception) unable to load library steamUI.dll," is available under the Creative Commons license. Any copy, reuse, or modification of the content should be sufficiently credited to CCM (
Steam - How to enable the Push-to-Talk mode
Error message - Steam.exe (main exception) to run steam you must first connect to the internet