diff --git a/include/extern.h b/include/extern.h
index d59035f37..39b969ace 100644
--- a/include/extern.h
+++ b/include/extern.h
@@ -3889,6 +3889,7 @@ extern void wizcustom_callback(winid win, int glyphnum, char *id);
 extern int wiz_display_macros(void);
 extern int wiz_mon_diff(void);
 extern int wiz_objprobs(void);
+extern int wiz_show_nhuuid(void);
 #endif
 extern void sanity_check(void);
 
diff --git a/src/cmd.c b/src/cmd.c
index 3bcc3f3c4..23f3d2cd8 100644
--- a/src/cmd.c
+++ b/src/cmd.c
@@ -1989,6 +1989,8 @@ struct ext_func_tab extcmdlist[] = {
               wiz_rumor_check, IFBURIED | AUTOCOMPLETE | WIZMODECMD, NULL },
     { '\0',   "wizseenv", "show map locations' seen vectors",
               wiz_show_seenv, IFBURIED | AUTOCOMPLETE | WIZMODECMD, NULL },
+    { '\0', "wizshownhuuid", "show NHUUID for this game",
+              wiz_show_nhuuid, AUTOCOMPLETE | WIZMODECMD, NULL },
     { '\0',   "wizsmell", "smell monster",
               wiz_smell, IFBURIED | AUTOCOMPLETE | WIZMODECMD, NULL },
     { '\0',   "wiztelekinesis", "telekinesis",
diff --git a/src/files.c b/src/files.c
index 4bf2a42e0..1d45c2559 100644
--- a/src/files.c
+++ b/src/files.c
@@ -660,8 +660,9 @@ create_levelfile(int lev, char errbuf[])
             Sprintf(errbuf,
                     "Cannot create file \"%s\" for level %d (errno %d).",
                     gl.lock, lev, errno);
-#if defined(MSDOS)
-        setmode(nhfp->fd, O_BINARY);
+#if defined(MSDOS) || defined(WIN32)
+        if (nhfp->fd >= 0)
+            (void) setmode(nhfp->fd, O_BINARY);
 #endif
     }
     nhfp = viable_nhfile(nhfp);
@@ -705,8 +706,9 @@ open_levelfile(int lev, char errbuf[])
             Sprintf(errbuf,
                     "Cannot open file \"%s\" for level %d (errno %d).",
                     gl.lock, lev, errno);
-#if defined(MSDOS)
-        setmode(nhfp->fd, O_BINARY);
+#if defined(MSDOS) || defined(WIN32)
+        if (nhfp->fd >= 0)
+            (void) setmode(nhfp->fd, O_BINARY);
 #endif
     }
     nhfp = viable_nhfile(nhfp);
@@ -883,8 +885,9 @@ create_bonesfile(d_level *lev, char **bonesid, char errbuf[])
 #endif  /* ?MICRO || WIN32 */
             if (nhfp->fd < 0)
                 failed = errno;
-#if defined(MSDOS)
-            setmode(nhfp->fd, O_BINARY);
+#if defined(MSDOS) || defined(WIN32)
+            if (nhfp->fd >= 0)
+                (void) setmode(nhfp->fd, O_BINARY);
 #endif
         }
         if (failed && errbuf)  /* failure explanation */
@@ -976,8 +979,9 @@ open_bonesfile(d_level *lev, char **bonesid)
 #else
             nhfp->fd = open(fq_bones, O_RDONLY | O_BINARY, 0);
 #endif
-#if defined(MSDOS)
-            setmode(nhfp->fd, O_BINARY);
+#if defined(MSDOS) || defined(WIN32)
+            if (nhfp->fd >= 0)
+                (void) setmode(nhfp->fd, O_BINARY);
 #endif
         }
     }
@@ -1188,8 +1192,8 @@ create_savefile(void)
 #endif
 #endif /* MICRO || WIN32 */
 #if defined(MSDOS) || defined(WIN32)
-        if (nhfp->fd >= 0)
-            (void) setmode(nhfp->fd, O_BINARY);
+            if (nhfp->fd >= 0)
+                (void) setmode(nhfp->fd, O_BINARY);
 #endif
         }
     }
@@ -2989,6 +2993,9 @@ recover_savefile(void)
     if (savewrite_failure)
         goto cleanup;
 
+    if (snhfp->structlevel)
+        bufoff(snhfp->fd);
+
     /* TODO: this is not a single byte, so a big-endian byte swap
      * might be necessary here, if anyone is concerned about big-endian */
     Sfo_int(snhfp, &pltmpsiz, "plname-size");
@@ -3041,6 +3048,8 @@ recover_savefile(void)
             }
         }
     }
+    if (snhfp->structlevel)
+        bufon(snhfp->fd);
     close_nhfile(snhfp);
     /*
      * We have a successful savefile!
diff --git a/src/wizcmds.c b/src/wizcmds.c
index 0c9e78719..328e823d6 100644
--- a/src/wizcmds.c
+++ b/src/wizcmds.c
@@ -1777,6 +1777,14 @@ wiz_display_macros(void)
     return ECMD_OK;
 }
 
+/* the #wizshownhuuid command */
+int
+wiz_show_nhuuid(void)
+{
+    pline("The NHUUID for this game is { %s }.", svn.nhuuid);
+    return ECMD_OK;
+}
+
 /* the #wizmondiff command */
 int
 wiz_mon_diff(void)