I have installed WAMP on my Windows 8, now for some reasons I need to know if it is 32bit or 64. Browsed around and looked in 'abouts' and version/licence files but couldn't find anywhere. It is WAMPServer 2.2 by the way.
One easy way is to look in the process list. Bring up the Windows Task Manager. On the processes tab locate the WAMPServer process. If it is running as a 32-bit process it was say "(32 bit)" after the name. If it doesn't it is a 64-bit process.
Obviously... if you are running 32-bit Windows 8 then WAMPServer is a 32-bit process.
Update: In Windows 10 there is a Platform column in Task Manager. To see it click the 'Details' tab, right-click on the header for the task list and choose 'Select Columns'. Tick 'Platform' - it is near the bottom of the list