Perflib_Perfdataxxx.dat Files Accumulate Under %SystemRoot%\System32

Files with the name Perflib_Perfdataxxx.dat may accumulate under the %SystemRoot%\System32 folder, where xxx is a random number.

These files are generated by processes in the normal course of operation; however, files are orphaned when you do not shut down a computer properly, such as by pressing the power button on a computer.

Note: It is also possible that these files can be orphaned while a server is running. Microsoft is researching this problem and will post more information in this article when the information becomes available.

To delete the orphaned files, you can use an automated logon script.