diff --git a/os2/dirstruct.txt b/os2/dirstruct.txt
new file mode 100644
index 00000000000..555400cd6b3
--- /dev/null
+++ b/os2/dirstruct.txt
@@ -0,0 +1,50 @@
+Win32 and os2ss sight to the system partition 
++C				< contains under os2ss a autogenerated config.sys
+ |
+ +-ROS
+   +-NATIVE		< NTDLL, ntoskrnl, hal.dll, csrss.exe os2.exe psx.exe ... 
+   | +-DRIVERS	< *.SYS
+   | +-CONFIG	< registry
+   +-WIN32
+   | +-SYSTEM	< user32.dll kernel32.dll ...
+   | +-FONTS
+   | +...
+   +-OS2
+   | +-DLL		< doscalls.dll ....
+   | +-SYSTEM
+   | +-...
+   +-PSX
+     +-etc		< mountpoint for posix apps
+     +-bin
+     +-dev
+     +-lib		< posix.dll
+     +-tmp
+     +-var
+     +-mnt		< empty
+
+posix sight to the system partition 
+ /
+ +-etc		< mountpoint for posix apps
+ +-bin
+ +-dev		< link to OB-mans Devices
+ +-lib		< posix.dll
+ +-tmp		< alias to systemtemp
+ +-var
+ +-mnt
+   +-C		< win32-driveletters             
+   |  |
+   |  +-ROS
+   |    +-NATIVE		< NTDLL, ntoskrnl, hal.dll, csrss.exe os2.exe psx.exe ...
+   |    | +-DRIVERS	< *.SYS
+   |    | +-CONFIG	< registry
+   |    +-WIN32
+   |    | +-SYSTEM	< user32.dll kernel32.dll ...
+   |    | +-FONTS
+   |    | +...
+   |    +-OS2		<some apps
+   |    | +-DLL		< doscalls.dll ....
+   |    | +-SYSTEM
+   |    | +-...
+   |    +-PSX		< empty
+   +-D
+   +-E...