diff -Naur Python-3.8.0-orig/Lib/venv/scripts/common/activate Python-3.8.0/Lib/venv/scripts/common/activate
--- Python-3.8.0-orig/Lib/venv/scripts/common/activate	2019-10-14 16:34:47.000000000 +0300
+++ Python-3.8.0/Lib/venv/scripts/common/activate	2019-10-22 10:05:22.783203700 +0300
@@ -37,7 +37,7 @@
 # unset irrelevant variables
 deactivate nondestructive
 
-VIRTUAL_ENV="__VENV_DIR__"
+VIRTUAL_ENV=$(cygpath "__VENV_DIR__")
 export VIRTUAL_ENV
 
 _OLD_VIRTUAL_PATH="$PATH"