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Now the file gets saved as blg, but I would like a txt version to import in Excel.

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up vote 6 down vote accepted

If you have an existing BLG file you would like to convert to CSV, you can use the command relog for this purpose. The format is:

relog -f csv input.blg -o output.csv

If you are talking about changing the collector to use a CSV by default, it is a setting in Perfmon itself. On the Log Files tab of your counter, you change the "log file type" to be Text File (comma delimited).

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