diff --git a/src/os_win32.c b/src/os_win32.c
index 26005b2..ce03557 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -4490,8 +4490,25 @@
 {
     int		ret;
     WCHAR	*wcmd;
+    char_u	*buf;
+    size_t	len;
 
-    wcmd = enc_to_utf16((char_u *)cmd, NULL);
+    // If the command starts and ends with double quotes, enclose the command
+    // in parentheses.
+    len = STRLEN(cmd);
+    if (len >= 2 && cmd[0] == '"' && cmd[len - 1] == '"')
+    {
+	len += 3;
+	buf = alloc(len);
+	if (buf == NULL)
+	    return -1;
+	vim_snprintf((char *)buf, len, "(%s)", cmd);
+	wcmd = enc_to_utf16(buf, NULL);
+	free(buf);
+    }
+    else
+	wcmd = enc_to_utf16((char_u *)cmd, NULL);
+
     if (wcmd == NULL)
 	return -1;