FIX: You cannot open a file that is at least 4 GB to append or to write data by using a Visual C++ 2010 application

This hotfix changes the behavior of the fopen() family of functions. After you apply this hotfix, the fopen() function internally uses a function that can seek beyond the 4 GB limit without returning an error. Specifically, the fopen() function uses the _lseeki64() function instead of the _lseek() function.

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

To apply this hotfix, you must have Microsoft Visual Studio 2010 Service Pack 1 (SP1) installed.

Restart requirement

You may have to restart the computer after you install this hotfix if the affected files are being used.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

For all supported versions of Microsoft Visual Studio 2010 SP1