Q:

How to find out if an installed Eclipse is 32 or 64 bit version?

How can I find out if a specific Eclipse instance on my (Windows 7) PC is the 32-bit or 64-bit version?
I've checked the About screen and the maze of dialogs one can call from there, but I didn't find any clues.
Also, right-clicking eclipse.exe in Windows explorer and opening the properties dialog box didn't give any hints.

A:

Hit Ctrl+Alt+Del to open the Windows Task manager and switch to the processes tab.
32-bit programs should be marked with *32.

A:

Open eclipse.ini in the installation directory, and observe the line with text:
plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.0.200.v20090519
then it is 64 bit.   
If it would be plugins/org.eclipse.equinox.launcher.win32.win32.x86_32_1.0.200.v20090519 then it is 32 bit.

A:

Help -> About Eclipse -> Installation Details -> tab Configuration
Look for -arch, and below it you'll see either x86_64 (meaning 64bit) or x86 (meaning 32bit).

