update README

contrib/windows/installer/readme.txt

@@ -10,11 +10,11 @@ As a general-purpose DOS emulator, DOSBox-X has many useful and unique features
 DOSBox-X Quick Start
 ====================
 
-Type INTRO in DOSBox-X for a quick tour. It is essential that you get familiar with the idea of mounting, since DOSBox-X does not automatically make any drive (or a part of it) accessible to the emulation, unless you turn on automatic mounting of available Windows drives at start by setting the option "automountall" to "true" (without quotes) in DOSBox-X's config file, which is dosbox-x.conf by default.
+Type HELP to see a list of DOSBox-X's shell commands, and INTRO for a quick tour to DOSBox-X. It is essential that you get familiar with the idea of mounting, since DOSBox-X does not automatically make any drive (or a part of it) accessible to the emulation, unless you turn on automatic mounting of available Windows drives at start by setting the option "automountall" to "true" (without quotes) in DOSBox-X's configuration.
 
-At the beginning you have got a Z:\> instead of a C:\> at the DOSBox-X prompt. Since no drives are mounted yet, you need to make your directories available as drives in DOSBox-X by using the "mount" command. For example, the command line "mount C D:\GAMES" will give you a C drive in DOSBox-X which points to your Windows D:\GAMES directory (that was created before). To change to the drive mounted like above, type "C:". If everything went fine, DOSBox-X will display the prompt "C:\>".
+At the beginning you have got a Z:\> instead of a C:\> at the DOSBox-X prompt. Since no drives are mounted yet, you need to make your directories available as drives in DOSBox-X. DOSBox-X features a drop-down menu where you can do many things without typing commands. Check out the "Drive" menu to mount drives from DOSBox-X's graphical interface. Select a drive, such as "C", and click "Mount as Hard Disk", then the Windows file browser will appear. Select a folder and click "OK", then this folder will be mounted as Drive C: in DOSBox-X. Alternatively, you can mount drives in DOSBox-X with the "mount" command. For example, the command line "mount C D:\GAMES" will give you a C drive in DOSBox-X which points to your Windows D:\GAMES directory (that was created before).
 
-You do not have to always type these commands. Check out the "Drive" menu to mount drives from DOSBox-X's graphical interface. There is also an [autoexec] section in DOSBox-X's config file. The commands present there are run when DOSBox-X starts, so you can use this section for the mounting and other purposes, such as launching a specific program you want to use, or a game you want to play.
+To change to the drive mounted like above, type "C:". If everything went fine, DOSBox-X will display the prompt "C:\>". You do not have to manually mount drives after DOSBox-X starts. Click the "Main" menu, and select "Configuration tool". Then select the "AUTOEXEC.BAT" setting group, where you can change its contents. The commands present here are run when DOSBox-X starts, so you can use this section for the mounting and other purposes, such as launching a specific program you want to use, or a game you want to play. You can also quickly launch a DOS program or game in DOSBox-X by clicking "Quick launch program..." under "DOS" menu.
 
 Further Information
 ===================

vs2015/dosbox-x.vcxproj.filters

@@ -115,9 +115,6 @@
     <Filter Include="Sources\libs\zmbv">
       <UniqueIdentifier>{fd585132-36d9-4941-8490-3821d36aec5a}</UniqueIdentifier>
     </Filter>
-    <Filter Include="Sources\hardware\sound\opl2board">
-      <UniqueIdentifier>{b7907a19-6377-4a5d-9acd-3b02efefbc09}</UniqueIdentifier>
-    </Filter>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\src\aviwriter\avi_rw_iobuf.cpp">
@@ -309,9 +306,6 @@
     <ClCompile Include="..\src\fpu\fpu.cpp">
       <Filter>Sources\fpu</Filter>
     </ClCompile>
-    <ClCompile Include="..\src\hardware\opl2board\opl2board.cpp">
-      <Filter>Sources\hardware\sound\opl2board</Filter>
-    </ClCompile>
     <ClCompile Include="..\src\gui\menu.cpp">
       <Filter>Sources\gui</Filter>
     </ClCompile>
@@ -936,6 +930,7 @@
     <ClCompile Include="..\src\hardware\serialport\serialfile.cpp">
       <Filter>Sources\hardware\serialport</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\hardware\opl2board\opl2board.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\src\aviwriter\avi.h">
@@ -998,9 +993,6 @@
     <ClInclude Include="..\src\fpu\fpu_instructions.h">
       <Filter>Sources\fpu</Filter>
     </ClInclude>
-    <ClCompile Include="..\src\hardware\opl2board\opl2board.h">
-      <Filter>Sources\hardware\sound\opl2board</Filter>
-    </ClCompile>
     <ClInclude Include="..\src\gui\dosbox.cga640.bmp.h">
       <Filter>Sources\gui</Filter>
     </ClInclude>
@@ -1769,6 +1761,7 @@
     <ClInclude Include="..\src\hardware\serialport\serialfile.h">
       <Filter>Sources\hardware\serialport</Filter>
     </ClInclude>
+    <ClInclude Include="..\src\hardware\opl2board\opl2board.h" />
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="..\src\winres.rc">