commit 93c479edf1b12accd3291ad7cddd064f85c3a522
Author: Benjamin Gilbert <bgilbert@cs.cmu.edu>
Date:   Fri Jul 4 06:58:21 2025 -0700

    tools: open output files using Unicode paths on Windows
    
    We receive filename arguments in Unicode.  Don't open them in the ANSI
    code page, mangling the filenames.
    
    Signed-off-by: Benjamin Gilbert <bgilbert@cs.cmu.edu>

diff --git a/tools/slidetool-util.c b/tools/slidetool-util.c
index 7a0de731245f..041df9c29163 100644
--- a/tools/slidetool-util.c
+++ b/tools/slidetool-util.c
@@ -33,7 +33,17 @@
 struct output open_output(const char *filename) {
   struct output out;
   if (filename) {
+#ifdef _WIN32
+    GError *tmp_err = NULL;
+    g_autofree wchar_t *filename16 =
+      (wchar_t *) g_utf8_to_utf16(filename, -1, NULL, NULL, &tmp_err);
+    if (filename16 == NULL) {
+      common_fail("Couldn't open %s: %s", filename, tmp_err->message);
+    }
+    FILE *fp = _wfopen(filename16, L"wb");
+#else
     FILE *fp = fopen(filename, "wb");
+#endif
     if (!fp) {
       common_fail("Can't open %s for writing: %s", filename, strerror(errno));
     }