Windows 2000 Cannot Open Windows XP .blg Log Files

If you attempt to open a Windows XP binary performance log (.blg) file in Windows 2000, you receive the following error message:

Even though the file name extension is the same, the format of .blg files is changed in Windows XP. This new format cannot be read by System Monitor in Windows 2000.

To work around this issue, use either of the following methods:

• Use the Relog.exe command-line tool to convert the .blg file from the Windows XP format to a format that Windows 2000 System Monitor can read (such as the .tsv or .csv format).
• Open the log on a Windows XP-based computer.

This behavior is by design.

To convert a .blg file from Windows XP format to a .csv file, follow these steps:

1. On the Windows XP-based computer, start a command prompt by clicking Start, pointing to Run, typing cmd, and then clicking OK.
2. Change directories to the folder that contains the .blg file.
3. At the command prompt, type
   relog filename.blg -f CSV -o newfile.csv
   where filename.blg is the Windows XP .blg file, and newfile.csv is the name of the file that will be created in the new format.
   
   
4. Copy the new file to the Windows 2000-based computer and open it with System Monitor.

For additional information and the syntax for Relog.exe, use Windows XP Help and Support Center. For additional information about Windows 2000 System Monitor, click the article number below to view the article in the Microsoft Knowledge Base: