--- a/src/os/win32/ngx_files.c
+++ b/src/os/win32/ngx_files.c
@@ -5,9 +5,37 @@
 
 ssize_t ngx_read_file(ngx_file_t *file, char *buf, size_t size, off_t offset)
 {
-    size_t n;
+    size_t      n;
+    long        high_offset;
+    ngx_err_t   err;
+    OVERLAPPED  ovlp, *povlp;
 
-    if (ReadFile(file->fd, buf, size, &n, NULL) == 0) {
+    if (ngx_win32_version < NGX_WIN_NT) {
+        high_offset = (long) (offset >> 32);
+        if (SetFilePointer(file->fd, (long) offset, &high_offset, FILE_BEGIN)
+                                                                 == 0xFFFFFFFF)
+        {
+            err = ngx_errno;
+            if (err != NO_ERROR) {
+                ngx_log_error(NGX_LOG_ERR, file->log, err,
+                              "SeekFilePointer() failed");
+                return NGX_ERROR;
+            }
+        }
+
+        povlp = NULL;
+
+    } else {
+        ovlp.Internal = 0;
+        ovlp.InternalHigh = 0;
+        ovlp.Offset = (DWORD) offset;
+        ovlp.OffsetHigh = (DWORD) (offset >> 32);
+        ovlp.hEvent = NULL;
+
+        povlp = &ovlp;
+    }
+
+    if (ReadFile(file->fd, buf, size, &n, povlp) == 0) {
         ngx_log_error(NGX_LOG_ERR, file->log, ngx_errno, "ReadFile() failed");
         return NGX_ERROR;
     }
@@ -18,6 +46,25 @@ ssize_t ngx_read_file(ngx_file_t *file, 
 }
 
 
+/* TODO: as read file */
+
+ssize_t ngx_write_file(ngx_file_t *file, char *buf, size_t size, off_t offset)
+{
+    size_t n;
+
+    if (WriteFile(file->fd, buf, size, &n, NULL) == 0) {
+        ngx_log_error(NGX_LOG_ERR, file->log, ngx_errno, "WriteFile() failed");
+        return NGX_ERROR;
+    }
+
+    file->offset += n;
+
+    return n;
+}
+
+
+/* TODO: log error */
+
 int ngx_file_append_mode(ngx_fd_t fd)
 {
     if (SetFilePointer(fd, 0, NULL, FILE_END) == 0xFFFFFFFF) {