Original Article is located here but unfortunately is in Spanish.

So let’s translate original article and I will put additional comments on it:

Step 1.) Installing wine
Wine is application which allow you to execute windows files on Unix enviroment. Because this article is for Ubuntu (my current version is 7.04) I assume that it’s installed, but if not, run the following command:

to check if you have it just run

the wine verssion will be displayed.

Step 2.) Configuring wine
I never used this but if you want to make fine tunning fust execute in the terminal:

the configuration window will be displayed.

Step 3.) Downloading Instant client for Oracle.
Go to Oracle Instant Client page and download BASIC instant client. You mus have account in www.oracle.com (The registration is free).

The version which I got is:
instantclient-basic-win32-10.2.0.3-20061115.zip

Step 4.) Creating directories for instant client
My opinion is that structure is not needed /everything is possible to fit in one dir, but I am trying to follow the original article/ so:

Step 5.) Decompress contents from instant client archive
Decompress files to $HOME/.wine/drive_c/ORA/BIN

Step 6.) Creating Oracle Related Variables (ORACLE_HOME)
Run good old regedit with

create key Oracle as example. in that key add label ORACLE_HOME with value C:\ORA

add ot PATH C:\ORA;C:\ORA\BIN. PATH value is under HKEY_LOCAL_MACHINE > System > CurrentControlSet > Control > SessionManager > Environment

Step 7.) Installing Toad
Get version of TOAD for Windows. Run instalation with:

Follow the instalation instructions. At the end you should have installed TOAD. Enter Registration key to unlock the Toad.

Step 8.) Create/Get copy of tnsnames.ora
that file contains the connection details to your oracle servers. Put the file under $HOME/.wine/drive_c/ORA/NETWORK/ADMIN/ directory.

Step 9.) Run Toad

This is the brief translation from the otiginal.
The author recommends to put copy of MFC42.DLL file under C:\windows\system32

the problem was that when I follow these steps I had Toad installed, Oracle home (as shown on image)

but, I didn’t manage to connect to my servers.

So here are the extension to instalation steps.

Step 10.) create TNS_ADMIN value
Under HKEY_LOCAL_MACHINE > System > CurrentControlSet > Control > SessionManager > Environment (the same key where the PATH valriable is).
As value put the path to tnsnames.ora file:

Step 11.) the most important to my experience
To tell you the truth, I did Step 10 in the beggining (then I add Oracle key in reg edit), but this didnt solve the problem. There was no action after choosing Database and inserting Username and Password. Just nothing - the connection screen saw shown and no action. Then I downloaded SQL*Plus package, because I saw that the problem is somewhere between Oracle and the Client (not Toad). well I install it and guess what … the sqlplus.exe was searched for OCI.dll, but in my folder I had only oci.dll. on windows this is he same, but for people familiar with Unix is obvious that these files are different. so what I did is to copy oci.dll to OCI.dll
so my C:\ORA\BIN directory looking like:

and as you can see there are 2 files oci and OCI.
This trick solve my problem and now I have perfect tool for DBA.