Steam error message: Steam.exe (main exception)

December 2016

Steam is a gamer's delight. It is the ultimate online gaming platform allowing gamers to access, play, download and purchase video games and to interact with people with similar interests. Sometimes when Steam starts up an error message 'Steam.exe (main exception)' is displayed. To solve this problem, the installation folder needs to be checked and modifications made in order to contain the error.


When I start Steam, a window appears saying:

Steam.exe (main exception): "Steam Crash: CMultiFieldBlob(pSerialized): Bad field - extend past end of blob"  


  • Browse your hard disk to find the Steam installation folder.
  • Find the following file: ClientRegistry.blob
  • Delete it, then restart your PC.

Related :

This document entitled « Steam error message: Steam.exe (main exception)  » from CCM ( is made available under the Creative Commons license. You can copy, modify copies of this page, under the conditions stipulated by the license, as this note appears clearly.