diff --git a/tools/download_statistic/aggregator b/tools/download_statistic/aggregator.py
similarity index 100%
rename from tools/download_statistic/aggregator
rename to tools/download_statistic/aggregator.py
diff --git a/tools/download_statistic/calc_statistic b/tools/download_statistic/calc_statistic
deleted file mode 100755
index 9775e3dc1f..0000000000
--- a/tools/download_statistic/calc_statistic
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-./linezier | ./remover | ./columnizer | ./resolver | ./aggregator
\ No newline at end of file
diff --git a/tools/download_statistic/calc_statistic.sh b/tools/download_statistic/calc_statistic.sh
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+./linezier.sh | ./remover.sh | ./columnizer.sh | ./resolver.py | ./aggregator.py
diff --git a/tools/download_statistic/columnizer b/tools/download_statistic/columnizer.sh
similarity index 100%
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diff --git a/tools/download_statistic/linezier b/tools/download_statistic/linezier.sh
similarity index 100%
rename from tools/download_statistic/linezier
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diff --git a/tools/download_statistic/remover b/tools/download_statistic/remover.sh
similarity index 100%
rename from tools/download_statistic/remover
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diff --git a/tools/download_statistic/resolver b/tools/download_statistic/resolver.py
similarity index 100%
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