https://github.com/WoeUSB/WoeUSB-ng/pull/134
Fix invalid escape sequence
\. is not a valid escape sequence since Python 3.12 and generates a warning.
It will become an error in a future version.
https://docs.python.org/3.12/whatsnew/3.12.html#other-language-changes
--- a/WoeUSB/workaround.py
+++ b/WoeUSB/workaround.py
@@ -52,7 +52,7 @@ def support_windows_7_uefi_boot(source_fs_mountpoint, target_fs_mountpoint):
     :param target_fs_mountpoint:
     :return:
     """
-    grep = subprocess.run(["grep", "--extended-regexp", "--quiet", "^MinServer=7[0-9]{3}\.[0-9]",
+    grep = subprocess.run(["grep", "--extended-regexp", "--quiet", r"^MinServer=7[0-9]{3}\.[0-9]",
                            source_fs_mountpoint + "/sources/cversion.ini"],
                           stdout=subprocess.PIPE).stdout.decode("utf-8").strip()
     if grep == "" and not os.path.isfile(source_fs_mountpoint + "/bootmgr.efi"):