1, if it is downloaded on the official website, look at the compression package name can be seen, only with Win32 words is 32, with win32-x86_64 the word is 64 bits.
What if you already have a lot of installed packages that can't be found?
2, find the Eclipse installation directory Eclipse.ini file Open, under the Launcher.library key, if the win32.x86 is 32 bit, if the win32.x86_64 is 64 bits.
-startupplugins/org.eclipse.equinox.launcher_1.3.0.v20140415-2008.jar--launcher.libraryplugins/ org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200. V20150204-1316-productorg.eclipse.epp.package.jee.product--launcher.defaultactionopenfile--launcher.xxmaxpermsize256m-sho Wsplashorg.eclipse.platform--launcher.xxmaxpermsize256m--launcher.defaultactionopenfile--launcher.appendvmargs-vmargs-dos gi.requiredjavaversion=1.6-xms40m-xmx512m
How to see if Eclipse is 32-bit or 64-bit
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