Control use of the File System API for writing

Setting the policy to 3 lets websites ask for write access to files and directories in the host operating system's file system. Setting the policy to 2 denies access.

Leaving it unset lets websites ask for access, but users can change this setting.

Supported on: At least Microsoft Windows 7 or Windows Server 2008 family

Control use of the File System API for writing


  1. Do not allow any site to request write access to files and directories
    Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
    Registry PathSoftware\Policies\Google\Chrome
    Value NameDefaultFileSystemWriteGuardSetting
    Value TypeREG_DWORD
    Value2
  2. Allow sites to ask the user to grant write access to files and directories
    Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
    Registry PathSoftware\Policies\Google\Chrome
    Value NameDefaultFileSystemWriteGuardSetting
    Value TypeREG_DWORD
    Value3


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