First we gotta install it. Just make a directory and unzip in it....could be
C:\W32dasm, or like me, C:\Program files\W32dasm.

Once you got it unzipped just click on the w32dasm.exe and W32dasm open...better to have full screen view if it doesnt automatically open like this.
Now you looking at a screen with menu and buttons.

To open a file to disassemble you can either go to Disassembler menu (thats top left) and click 'open file to disassemble', or click on the 'open file to disassemble' button (top left but directly below the menu option).

In the message box that appears, just scroll round till you find the file you want and click open.
Depending on the size of the file...could happen quick, or take a while...it'll disassemble. Just wait till it finishes.

You now got a whole 'dead listing' of the programs code, and you should be able to follow the tuts you find that use this tool.

If you look along the top you see a row of menu items and below these a row of buttons. A few of the buttons you should get familiar with are:

• 'Strn ReF' button..second in from the right. This button is mentioned quite regularly in tuts to search for string references in program. Click this button and a box with 'strings of text' that are used in the program is displayed...like 'register', 'invalid serial number', etc. Double click a line and you'll jump to the place in the code that that line is. (Note, not all programs have string references).
• 'Jump To' and 'Ret JMP' buttons..near the middle. Used for following jumps and returning from them. There also hotkeys for these functions. Right arrow key follows a jump...Ctrl and left arrow key returns from the jump (to follow a jump the line in the code has to be highlighted).
• 'Call' and 'RET' buttons.. to the right of the 'RET JMP' button. Used for following and returning from calls. Also hotkeys. Right arrow key to follw a call...left arrow key to return.

Note: these buttons will 'light up' when they are useable.

Another function you use quite often is the 'Goto' menu...along the top about halfway. Click on this menu item and you get four options, but probably the one you use most is 'Goto Code Location'...the last of the four. Click this option and a box appears. Type in the code location, click ok, and you be taken to that line of code. F12 also brings up this box.

Anyway, get used to this program coz a lot of tuts use it.