diff --git a/src/doconfig/doconfig.c b/src/doconfig/doconfig.c
index 1ed98914..1779e697 100644
--- a/src/doconfig/doconfig.c
+++ b/src/doconfig/doconfig.c
@@ -88,10 +88,6 @@ main(void)
     char *cp;
     char *pathname;
 
-#if defined(_WIN32)
-    _fmode = _O_BINARY;
-#endif
-
     if ((pathname = safe_getcwd()) == NULL) {
 	printf("Can't get current path!\n");
 	exit(-1);
@@ -141,7 +137,7 @@ wrmakesrc(char *pathname)
     char buf[256];
 
     sprintf(buf, "%s/src/make.src", pathname);
-    if ((fp = fopen(buf, "w")) == NULL) {
+    if ((fp = fopen(buf, "wb")) == NULL) {
 	printf("Cannot open %s for writing, exiting.\n", buf);
 	exit(-1);
     }
@@ -158,7 +154,7 @@ wripglob(char *filename)
     FILE *fp;
 
     printf("Writing %s\n", filename);
-    if ((fp = fopen(filename, "w")) == NULL) {
+    if ((fp = fopen(filename, "wb")) == NULL) {
 	printf("Cannot open %s for writing, exiting.\n", filename);
 	exit(-1);
     }
@@ -175,7 +171,7 @@ wrauth(char *filename)
     FILE *fp;
 
     printf("Writing %s\n", filename);
-    if ((fp = fopen(filename, "wt")) == NULL) {
+    if ((fp = fopen(filename, "w")) == NULL) {
 	printf("Cannot open %s for writing, exiting.\n", filename);
 	exit(-1);
     }
@@ -232,7 +228,7 @@ wrgamesdef(char *filename)
     }
 
     printf("Writing %s\n", filename);
-    if ((fp = fopen(filename, "w")) == NULL) {
+    if ((fp = fopen(filename, "wb")) == NULL) {
 	printf("Cannot open %s for writing, exiting.\n", filename);
 	exit(-1);
     }
diff --git a/src/lib/commands/info.c b/src/lib/commands/info.c
index cfc0866e..7038add9 100644
--- a/src/lib/commands/info.c
+++ b/src/lib/commands/info.c
@@ -305,7 +305,7 @@ info(void)
 	name = "TOP";
 
     _snprintf(filename, sizeof(filename) - 1, "%s\\%s", infodir, name);
-    fp = fopen(filename, "r");
+    fp = fopen(filename, "rb");
     if (fp == NULL) {
 	/* may be a "partial" request.  */
 	HANDLE hDir;
@@ -365,7 +365,7 @@ info(void)
 	}
 	_snprintf(filename, sizeof(filename), "%s/%s",
 		  infodir, last);
-	fp = fopen(filename, "r");
+	fp = fopen(filename, "rb");
 	if (fp == NULL) {
 	    pr("Error reading info file for %s\n", name);
 	    logerror("Cannot open for \"%s\" info file (%s)",
@@ -455,7 +455,7 @@ apro(void)
 	     (fData.dwFileAttributes == FILE_ATTRIBUTE_READONLY))) {
 	    _snprintf(filename, sizeof(filename), "%s\\%s", infodir,
 		      fData.cFileName);
-	    fp = fopen(filename, "r");
+	    fp = fopen(filename, "rb");
 	    alreadyhit = 0;
 	    nll = nlhl = 0;
 	    if (fp != NULL) {
diff --git a/src/lib/commands/mobu.c b/src/lib/commands/mobu.c
index a368c196..636f907c 100644
--- a/src/lib/commands/mobu.c
+++ b/src/lib/commands/mobu.c
@@ -61,7 +61,7 @@ mobupdate(void)
     else
 	minites = atol(player->argp[1]) * 60;
     time(&now);
-    if ((fp = fopen(timestampfil, "r+")) == NULL) {
+    if ((fp = fopen(timestampfil, "rb+")) == NULL) {
 	logerror("Unable to edit timestamp file.");
     } else {
 	rewind(fp);
diff --git a/src/lib/commands/rea.c b/src/lib/commands/rea.c
index b70f6fd5..fe0dc6fa 100644
--- a/src/lib/commands/rea.c
+++ b/src/lib/commands/rea.c
@@ -100,7 +100,7 @@ rea(void)
 	clear_telegram_is_new(player->cnum);
     }
 
-    if ((telfp = fopen(mbox, "r+")) == 0) {
+    if ((telfp = fopen(mbox, "rb+")) == 0) {
 	logerror("telegram file %s", mbox);
 	return RET_FAIL;
     }
@@ -201,7 +201,7 @@ rea(void)
 		/* Here, we just re-open the file for "w" only,
 		   and that will wipe the file clean automatically */
 		(void)fclose(telfp);
-		telfp = fopen((char *)mbox, "w");
+		telfp = fopen((char *)mbox, "wb");
 	    }
 	}
     }
diff --git a/src/lib/commands/turn.c b/src/lib/commands/turn.c
index 84deb678..d0567cbd 100644
--- a/src/lib/commands/turn.c
+++ b/src/lib/commands/turn.c
@@ -95,7 +95,7 @@ turn(void)
 	    pr("Writing empty no-login message.\n");
     }
 
-    fptr = fopen(msgfilepath, "w");
+    fptr = fopen(msgfilepath, "wb");
     if (fptr == NULL) {
 	pr("Something went wrong opening the message file.\n");
 	logerror("Could not open message file (%s).\n", msgfilepath);
diff --git a/src/lib/commands/upda.c b/src/lib/commands/upda.c
index 94adc79a..34cedc3e 100644
--- a/src/lib/commands/upda.c
+++ b/src/lib/commands/upda.c
@@ -51,7 +51,7 @@ upda(void)
     struct mob_acc_globals timestamps;
 
     if (opt_MOB_ACCESS) {
-	if ((fp = fopen(timestampfil, "r")) == NULL)
+	if ((fp = fopen(timestampfil, "rb")) == NULL)
 	    logerror("Unable to open timestamp file.");
 	else {
 	    rewind(fp);
diff --git a/src/lib/common/file.c b/src/lib/common/file.c
index e94b52c5..e35c775c 100644
--- a/src/lib/common/file.c
+++ b/src/lib/common/file.c
@@ -60,6 +60,9 @@ ef_open(int type, int mode, int how)
     static int block;
     int size;
 
+#if defined(_WIN32)
+    mode |= O_BINARY;
+#endif
     if (ef_check(type) < 0)
 	return 0;
     ep = &empfile[type];
diff --git a/src/lib/common/log.c b/src/lib/common/log.c
index 8419df7a..36e2b0d5 100644
--- a/src/lib/common/log.c
+++ b/src/lib/common/log.c
@@ -82,11 +82,7 @@ logerror(s_char *format, ...)
     if ((p = strchr(cbuf, '\n')) != 0)
 	*p = 0;
     (void)sprintf(buf1, "%s %s\n", cbuf, buf);
-#if defined(_WIN32)
-    if ((logf = open(logfile, O_WRONLY | O_CREAT | O_APPEND | O_TEXT, 0666)) < 0)
-#else
     if ((logf = open(logfile, O_WRONLY | O_CREAT | O_APPEND, 0666)) < 0)
-#endif
 	return;
     (void)write(logf, buf1, strlen(buf1));
     (void)close(logf);
diff --git a/src/lib/gen/emp_config.c b/src/lib/gen/emp_config.c
index e13736f7..4def08f3 100644
--- a/src/lib/gen/emp_config.c
+++ b/src/lib/gen/emp_config.c
@@ -92,7 +92,7 @@ emp_config(char *file)
 	fixup_files();
 	return 0;
     }
-    if ((fp = fopen(file, "rt")) == NULL) {
+    if ((fp = fopen(file, "r")) == NULL) {
 	fprintf(stderr, "Can't open %s for reading (%s)\n",
 		file, strerror(errno));
 	return -1;
diff --git a/src/lib/player/empdis.c b/src/lib/player/empdis.c
index 57654067..19e4f991 100644
--- a/src/lib/player/empdis.c
+++ b/src/lib/player/empdis.c
@@ -158,7 +158,7 @@ gamedown(void)
 
     if (player->god)
 	return 0;
-    if ((down_fp = fopen(downfil, "r")) == NULL)
+    if ((down_fp = fopen(downfil, "rb")) == NULL)
 	return 0;
     if (fread((void *)&tgm, sizeof(tgm), 1, down_fp) != 1) {
 	logerror("bad header on login message (downfil)");
diff --git a/src/lib/player/player.c b/src/lib/player/player.c
index a08b2e6e..92272fa2 100644
--- a/src/lib/player/player.c
+++ b/src/lib/player/player.c
@@ -347,7 +347,7 @@ show_motd(void)
     struct telstr tgm;
     char buf[MAXTELSIZE];
 
-    if ((motd_fp = fopen(motdfil, "r")) == NULL)
+    if ((motd_fp = fopen(motdfil, "rb")) == NULL)
     {
     	if (errno == ENOENT)
 	    return RET_OK;
@@ -387,7 +387,7 @@ match_user(char *file, struct player *p)
     char host[256];
     char user[256];
 
-    if ((fp = fopen(file, "rt")) == NULL) {
+    if ((fp = fopen(file, "r")) == NULL) {
 	/*logerror("Cannot find file %s", file); */
 	return 0;
     }
diff --git a/src/lib/subs/wu.c b/src/lib/subs/wu.c
index 036d94e4..292717ad 100644
--- a/src/lib/subs/wu.c
+++ b/src/lib/subs/wu.c
@@ -125,7 +125,11 @@ typed_wu(natid from, natid to, s_char *message, int type)
 	     (np->nat_stat & STAT_SANCT) == 0)) {
 	    return -1;
 	}
+#if !defined(_WIN32)
     if ((fd = open(box, O_WRONLY | O_APPEND, 0)) < 0) {
+#else
+    if ((fd = open(box, O_WRONLY | O_APPEND | O_BINARY, 0)) < 0) {
+#endif
 	logerror("telegram 'open' of %s (#%d) failed", box, to);
 	return -1;
     }
diff --git a/src/lib/update/anno.c b/src/lib/update/anno.c
index b5b11823..f7268364 100644
--- a/src/lib/update/anno.c
+++ b/src/lib/update/anno.c
@@ -65,12 +65,12 @@ delete_old_announcements(void)
     old = now - days(anno_keep_days);
     logerror("Deleting annos older than %s", ctime(&old));
 
-    if ((annfp = fopen(annfil, "r")) == NULL) {
+    if ((annfp = fopen(annfil, "rb")) == NULL) {
 	logerror("can't open telegram file %s for reading", annfil);
 	return;
     }
     sprintf(tmp_filename, "%s.tmp", annfil);
-    if ((tmpfp = fopen(tmp_filename, "w")) == NULL) {
+    if ((tmpfp = fopen(tmp_filename, "wb")) == NULL) {
 	logerror("can't open telegram file %s for writing",
 		 tmp_filename);
 	if (fclose(annfp) != 0)
diff --git a/src/server/main.c b/src/server/main.c
index f6b0b2c1..51b1c577 100644
--- a/src/server/main.c
+++ b/src/server/main.c
@@ -113,10 +113,6 @@ main(int argc, char **argv)
     int op;
     s_char tbuf[256];
 
-#if defined(_WIN32)
-    _fmode = _O_BINARY;
-#endif
-
     mainpid = getpid();
 
 #if defined(_WIN32)
diff --git a/src/server/timestamp.c b/src/server/timestamp.c
index c85c80f8..c8d0f5fb 100644
--- a/src/server/timestamp.c
+++ b/src/server/timestamp.c
@@ -52,7 +52,7 @@ mobility_check(void *unused)
     while (1) {
 	time(&now);
 /*		logerror("Updating timestamp file at %s", ctime(&now));*/
-	if ((fp = fopen(timestampfil, "r+")) == NULL) {
+	if ((fp = fopen(timestampfil, "rb+")) == NULL) {
 	    logerror("Unable to edit timestamp file.");
 	    continue;
 	}
@@ -97,7 +97,7 @@ mobility_init(void)
        mobility */
 
     time(&now);
-    if ((fp = fopen(timestampfil, "r+")) == NULL) {
+    if ((fp = fopen(timestampfil, "rb+")) == NULL) {
 	logerror("Unable to edit timestamp file.");
 	/* FIXME safe to continue? */
     } else {
diff --git a/src/util/fairland.c b/src/util/fairland.c
index 9d97ac2b..72faccba 100644
--- a/src/util/fairland.c
+++ b/src/util/fairland.c
@@ -194,10 +194,6 @@ main(int argc, char *argv[])
     char tbuf[512];
     int i = 0;
 
-#if defined(_WIN32)
-    _fmode = _O_BINARY;
-#endif
-    
     rnd_seed = time(NULL);
 
     while ((opt = getopt(argc, argv, "ae:ioqs:R:")) != EOF) {
@@ -411,7 +407,7 @@ allocate_memory(void)
 {
     int i;
 
-    sect_fptr = fopen(empfile[EF_SECTOR].file, "w");
+    sect_fptr = fopen(empfile[EF_SECTOR].file, "wb");
     if (sect_fptr == NULL) {
 	perror(empfile[EF_SECTOR].file);
 	return -1;
diff --git a/src/util/files.c b/src/util/files.c
index f0ad84fe..6acee2fb 100644
--- a/src/util/files.c
+++ b/src/util/files.c
@@ -88,10 +88,6 @@ main(int argc, char *argv[])
     char *config_file = NULL;
     int force = 0;
 
-#if defined(_WIN32)
-    _fmode = _O_BINARY;
-#endif
-
     while ((opt = getopt(argc, argv, "e:f")) != EOF) {
 	switch (opt) {
 	case 'e':