diff --git a/tools/winedump/Makefile.in b/tools/winedump/Makefile.in
index b55ac72f6d4..43e200ab6ed 100644
--- a/tools/winedump/Makefile.in
+++ b/tools/winedump/Makefile.in
@@ -17,6 +17,7 @@ C_SRCS = \
 	msc.c \
 	msmangle.c \
 	ne.c \
+	nls.c \
 	output.c \
 	pdb.c \
 	pe.c \
diff --git a/tools/winedump/dump.c b/tools/winedump/dump.c
index 85bc6815d1f..4e46687a355 100644
--- a/tools/winedump/dump.c
+++ b/tools/winedump/dump.c
@@ -40,8 +40,8 @@
 #include "winbase.h"
 #include "winedump.h"
 
-static void*			dump_base;
-static unsigned long		dump_total_len;
+void *dump_base = NULL;
+unsigned long dump_total_len = 0;
 
 void dump_data( const unsigned char *ptr, unsigned int size, const char *prefix )
 {
@@ -239,6 +239,7 @@ dumpers[] =
     {SIG_EMF,           get_kind_emf,   emf_dump},
     {SIG_FNT,           get_kind_fnt,   fnt_dump},
     {SIG_TLB,           get_kind_tlb,   tlb_dump},
+    {SIG_NLS,           get_kind_nls,   nls_dump},
     {SIG_UNKNOWN,       NULL,           NULL} /* sentinel */
 };
 
diff --git a/tools/winedump/nls.c b/tools/winedump/nls.c
new file mode 100644
index 00000000000..a114b770865
--- /dev/null
+++ b/tools/winedump/nls.c
@@ -0,0 +1,97 @@
+/*
+ * Dump a NLS file
+ *
+ * Copyright 2020 Alexandre Julliard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include "config.h"
+#include "wine/port.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "windef.h"
+#include "winedump.h"
+
+static const void *read_data( unsigned int *pos, unsigned int size )
+{
+    const void *ret = PRD( *pos, size );
+    *pos += size;
+    return ret;
+}
+
+static unsigned short casemap( const unsigned short *table, unsigned int len, unsigned short ch )
+{
+    unsigned int off = table[ch >> 8] + ((ch >> 4) & 0x0f);
+    if (off >= len) return 0;
+    off = table[off] + (ch & 0x0f);
+    if (off >= len) return 0;
+    return ch + table[off];
+}
+
+static void dump_casemap(void)
+{
+    int i, ch;
+    unsigned int pos = 0, upper_len, lower_len;
+    const unsigned short *header, *upper, *lower;
+
+    if (!(header = read_data( &pos, 2 * sizeof(*header) ))) return;
+    upper_len = header[1];
+    if (!(upper = read_data( &pos, upper_len * sizeof(*upper) )))
+    {
+        printf( "Invalid len %04x\n", header[1] );
+        return;
+    }
+    lower_len = dump_total_len / sizeof(*lower) - 2 - upper_len;
+    if (!(lower = read_data( &pos, lower_len * sizeof(*lower) ))) return;
+
+    printf( "Magic: %04x\n", header[0] );
+    printf( "Upper-case table:\n" );
+    for (i = 0; i < 0x10000; i++)
+    {
+        if (!(i % 16)) printf( "\n%04x:", i );
+        ch = casemap( upper, upper_len, i );
+        if (ch == i) printf( " ...." );
+        else printf( " %04x", ch );
+    }
+    printf( "\n\nLower-case table:\n" );
+    for (i = 0; i < 0x10000; i++)
+    {
+        if (!(i % 16)) printf( "\n%04x:", i );
+        ch = casemap( lower, lower_len, i );
+        if (ch == i) printf( " ...." );
+        else printf( " %04x", ch );
+    }
+    printf( "\n\n" );
+}
+
+void nls_dump(void)
+{
+    const char *name = strrchr( globals.input_name, '/' );
+    if (name) name++;
+    else name = globals.input_name;
+    if (!strcasecmp( name, "l_intl.nls" )) return dump_casemap();
+    fprintf( stderr, "Unrecognized file name '%s'\n", globals.input_name );
+}
+
+enum FileSig get_kind_nls(void)
+{
+    if (strlen( globals.input_name ) < 5) return SIG_UNKNOWN;
+    if (strcasecmp( globals.input_name + strlen(globals.input_name) - 4, ".nls" )) return SIG_UNKNOWN;
+    return SIG_NLS;
+}
diff --git a/tools/winedump/winedump.h b/tools/winedump/winedump.h
index c165872b439..c2671539009 100644
--- a/tools/winedump/winedump.h
+++ b/tools/winedump/winedump.h
@@ -137,6 +137,8 @@ typedef struct __globals
 } _globals;
 
 extern _globals globals;
+extern void *dump_base;
+extern unsigned long dump_total_len;
 
 /* Names to use for output DLL */
 #define OUTPUT_DLL_NAME \
@@ -214,7 +216,7 @@ const char *get_machine_str(int mach);
 
 /* file dumping functions */
 enum FileSig {SIG_UNKNOWN, SIG_DOS, SIG_PE, SIG_DBG, SIG_PDB, SIG_NE, SIG_LE, SIG_MDMP, SIG_COFFLIB, SIG_LNK,
-              SIG_EMF, SIG_FNT, SIG_TLB};
+              SIG_EMF, SIG_FNT, SIG_TLB, SIG_NLS};
 
 const void*	PRD(unsigned long prd, unsigned long len);
 unsigned long	Offset(const void* ptr);
@@ -254,6 +256,8 @@ enum FileSig    get_kind_fnt(void);
 void            fnt_dump( void );
 enum FileSig    get_kind_tlb(void);
 void            tlb_dump(void);
+enum FileSig    get_kind_nls(void);
+void            nls_dump(void);
 
 BOOL            codeview_dump_symbols(const void* root, unsigned long size);
 BOOL            codeview_dump_types_from_offsets(const void* table, const DWORD* offsets, unsigned num_types);