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When create a new `venv` on windows, sometimes an `UnicodeDecodeError` occurred.
It seems that, it is caused by the system module `site`.
In `Lib/site.py`, line 468::
 with open(virtual_conf) as f:
 for line in f:
 line = line.strip()
The file `virtual_conf` was open with encoding `gbk` which is my windows default encoding, but in fact, the file is an `utf-8` one, so i think it should be::
 with open(virtual_conf, encoding='utf-8') as f:
 for line in f:
 line = line.strip()

Already fixed in issue25185.