Program File 和 Program File (x86)

问题：有什么作用，有什么区别，怎么用，浪费空间？

百度：呵呵……

Google：

1.“The program will work and run correctly no matter where the files are kept.  The only reason there are two folders is for organiational purposes.  32-bit programs will run just fine on a 64-bit installation of Windows 7, but their files will be stored in the x86 folder so that 64-bit versions of the same files aren't accidentally copied on top of them.

You're asking for a lot of trouble if you try to change the installation path.”

引用自：    

2.Strongly urge you NOT to try removing it.

You have installed 64-bit Windows, and the dual 'Program files' structure is 'by design'.  32-bit software programs, by default, install to the 'Program files (x86)' folder.  This is to minimise or eliminate the risk of having both 32-bit and 64-bit installs of the same program present, and their installation files creating conflicts and/or performance problems.

Some software applications programs install both 32-bit and 64-bit versions of the program, so you should leave the structure as it is.  

If, on your machine, the contents are almost entirely 'duplicated' then that must mean that a large proportion of the software you have installed installs both platform versions.  On a machine here I just then checked, the (64-bit) Program Files folder was approximately 3Gb in size, whilst the (32-bit) Program Files (x86) folder was approximately 11Gb in size.

It's not "waste", you can be sure of that!

引用自：   Techwrighter

所以：

          1.这种情况只在64位操作系统下才有，只是为了减少同一应用出现32位和64位的安装冲突。

          2.安装程序默认装哪儿就装哪儿，别去管他。

          3.如果像我一样手贱，改了目录的也没关系，程序照样运行，只是安装发生异常的话就该考虑是否是32和64位的冲突（几乎不会）