diff --git a/copyparty/__main__.py b/copyparty/__main__.py
index 8b990997..d9dc64dc 100644
--- a/copyparty/__main__.py
+++ b/copyparty/__main__.py
@@ -42,6 +42,7 @@ from .util import (
     DEF_EXP,
     DEF_MTE,
     DEF_MTH,
+    HAVE_IPV6,
     IMPLICATIONS,
     JINJA_VER,
     MIMES,
@@ -293,6 +294,9 @@ def get_ah_salt() -> str:
 
 
 def ensure_locale() -> None:
+    if ANYWIN and PY2:
+        return  # maybe XP, so busted 65001
+
     safe = "en_US.UTF-8"
     for x in [
         safe,
@@ -1594,6 +1598,9 @@ def main(argv: Optional[list[str]] = None, rsrc: Optional[str] = None) -> None:
         if getattr(al, k1):
             setattr(al, k2, False)
 
+    if not HAVE_IPV6 and al.i == "::":
+        al.i = "0.0.0.0"
+
     al.i = al.i.split(",")
     try:
         if "-" in al.p:
diff --git a/copyparty/tcpsrv.py b/copyparty/tcpsrv.py
index 8d00eaab..4ee1b4dd 100644
--- a/copyparty/tcpsrv.py
+++ b/copyparty/tcpsrv.py
@@ -15,6 +15,7 @@ from .util import (
     E_ADDR_IN_USE,
     E_ADDR_NOT_AVAIL,
     E_UNREACH,
+    HAVE_IPV6,
     IP6ALL,
     Netdev,
     min_ex,
@@ -111,8 +112,10 @@ class TcpSrv(object):
 
         eps = {
             "127.0.0.1": Netdev("127.0.0.1", 0, "", "local only"),
-            "::1": Netdev("::1", 0, "", "local only"),
         }
+        if HAVE_IPV6:
+            eps["::1"] = Netdev("::1", 0, "", "local only")
+
         nonlocals = [x for x in self.args.i if x not in [k.split("/")[0] for k in eps]]
         if nonlocals:
             try:
diff --git a/copyparty/tftpd.py b/copyparty/tftpd.py
index 0ee45dec..c46a8fd5 100644
--- a/copyparty/tftpd.py
+++ b/copyparty/tftpd.py
@@ -33,7 +33,7 @@ from partftpy import (
 )
 from partftpy.TftpShared import TftpException
 
-from .__init__ import EXE, TYPE_CHECKING
+from .__init__ import EXE, PY2, TYPE_CHECKING
 from .authsrv import VFS
 from .bos import bos
 from .util import BytesIO, Daemon, ODict, exclude_dotfiles, min_ex, runhook, undot
@@ -95,7 +95,7 @@ class Tftpd(object):
                 TftpServer,
             ]
             cbak = []
-            if not self.args.tftp_no_fast and not EXE:
+            if not self.args.tftp_no_fast and not EXE and not PY2:
                 try:
                     ptn = re.compile(r"(^\s*)log\.debug\(.*\)$")
                     for C in Cs:
@@ -105,7 +105,7 @@ class Tftpd(object):
                         cfn = C.__spec__.origin
                         exec (compile(src2, filename=cfn, mode="exec"), C.__dict__)
                 except Exception:
-                    t = "failed to optimize tftp code; run with --tftp-noopt if there are issues:\n"
+                    t = "failed to optimize tftp code; run with --tftp-no-fast if there are issues:\n"
                     self.log("tftp", t + min_ex(), 3)
                     for n, zd in enumerate(cbak):
                         Cs[n].__dict__ = zd
diff --git a/copyparty/util.py b/copyparty/util.py
index 55068fe0..14a0bf1c 100644
--- a/copyparty/util.py
+++ b/copyparty/util.py
@@ -158,6 +158,17 @@ else:
     from urllib import unquote  # type: ignore # pylint: disable=no-name-in-module
 
 
+try:
+    socket.inet_pton(socket.AF_INET6, "::1")
+    HAVE_IPV6 = True
+except:
+    def inet_pton(fam, ip):
+        return socket.inet_aton(ip)
+
+    socket.inet_pton = inet_pton
+    HAVE_IPV6 = False
+
+
 try:
     struct.unpack(b">i", b"idgi")
     spack = struct.pack  # type: ignore
@@ -2459,6 +2470,9 @@ def build_netmap(csv: str):
         csv += ", 127.0.0.0/8, ::1/128"  # loopback
 
     srcs = [x.strip() for x in csv.split(",") if x.strip()]
+    if not HAVE_IPV6:
+        srcs = [x for x in srcs if ":" not in x]
+
     cidrs = []
     for zs in srcs:
         if not zs.endswith("."):
diff --git a/scripts/make-sfx.sh b/scripts/make-sfx.sh
index a1e3c190..798683fa 100755
--- a/scripts/make-sfx.sh
+++ b/scripts/make-sfx.sh
@@ -490,6 +490,11 @@ while IFS= read -r f; do
 	tmv "$f"
 done
 
+grep -rlE '^class [^(]+:' |
+while IFS= read -r f; do
+	ised 's/(^class [^(:]+):/\1(object):/' "$f"
+done
+
 # up2k goes from 28k to 22k laff
 awk 'BEGIN{gensub(//,"",1)}' </dev/null 2>/dev/null &&
 echo entabbening &&