Applied by tools/build_hactool.py after portable.patch. Ours: a manifest embedded through hactool.rc makes UTF-8 the
process code page (Windows 10 1903 and later), so paths and user profiles with non-ASCII names reach filepath.c intact.

diff --git a/Makefile b/Makefile
index e1913b8..73b7e3f 100644
--- a/Makefile
+++ b/Makefile
@@ -13,9 +13,19 @@ all:
 .c.o:
 	$(CC) $(INCLUDE) -c $(CFLAGS) -o $@ $<
 
-hactool$(EXEEXT): save.o sha.o aes.o extkeys.o rsa.o npdm.o bktr.o kip.o packages.o pki.o pfs0.o hfs0.o nca0_romfs.o romfs.o utils.o nax0.o nso.o lz4.o nca.o xci.o main.o filepath.o ConvertUTF.o cJSON.o
+# Windows: a manifest makes UTF-8 the process code page (Windows 10 1903 and later), so argv, getenv and fopen carry
+# UTF-8 as filepath.c expects: paths and user profiles with non-ASCII names work.
+ifeq ($(EXEEXT),.exe)
+WINDRES ?= windres
+RESOURCES = hactool.res.o
+endif
+
+hactool$(EXEEXT): save.o sha.o aes.o extkeys.o rsa.o npdm.o bktr.o kip.o packages.o pki.o pfs0.o hfs0.o nca0_romfs.o romfs.o utils.o nax0.o nso.o lz4.o nca.o xci.o main.o filepath.o ConvertUTF.o cJSON.o $(RESOURCES)
 	$(CC) -o $@ $^ -L $(LIBDIR) $(LDFLAGS)
 
+hactool.res.o: hactool.rc hactool.manifest
+	$(WINDRES) -O coff hactool.rc -o $@
+
 aes.o: aes.h types.h
 
 bktr.o: bktr.h types.h
diff --git a/hactool.manifest b/hactool.manifest
new file mode 100644
index 0000000..4073219
--- /dev/null
+++ b/hactool.manifest
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
+    <security>
+      <requestedPrivileges>
+        <requestedExecutionLevel level="asInvoker"/>
+      </requestedPrivileges>
+    </security>
+  </trustInfo>
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+    </application>
+  </compatibility>
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <activeCodePage xmlns="http://schemas.microsoft.com/SMI/2019/WindowsSettings">UTF-8</activeCodePage>
+    </windowsSettings>
+  </application>
+</assembly>
diff --git a/hactool.rc b/hactool.rc
new file mode 100644
index 0000000..543aa10
--- /dev/null
+++ b/hactool.rc
@@ -0,0 +1,2 @@
+/* Windows: argv, getenv and the narrow file functions use UTF-8 (Windows 10 1903 and later), as filepath.c expects. */
+1 24 "hactool.manifest"