: The "PTB" in your query refers to the Portuguese (Brazil) localized version of the update.

Microsoft officially ended support for Windows XP. This hotfix is an older, pre-2014 update. The original download link from Microsoft is likely broken, and the content is based on historical catalogs.

: Only install this hotfix if you are absolutely certain you have the bug. Do not use on any Internet-connected Windows XP machine, as XP is highly insecure.

According to archived Microsoft documentation, KB968730 addressed a . The bug manifested when users performed the following actions:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\Locale

: It completely supersedes the older KB938397 update. If you need both SHA-2 enrollment and processing, only KB968730 is required. Usage Review & Practical Impact