I have installed x64 on my new motherboard and installed several applications including FS9. However, there seems to be some confusion on the part of a couple of apps (including add-ons for FS9) with the location of FS9.There are two folders in the root directory... one named Program Files, the other Program Files (x86). MSFS2004 installed itself into the Program Files (x86) folder using its normal location of Microsoft Games etc. The registry indicates the same.At least one add-on has installed into the Program Files folder because I wasn't sharp enough to catch the lack of (x86) in the install dialog box. I am now a bit hesitant about installing any more add-ons to FS9 until I feel confident as to which folder is proper.I have searched for information of the proper use of both folders, both in Google and the MS Knowledge Base and find nothing that helps.Can anyone tell me what would the criteria would be for installing in "Program Files" versus "Program Files (x86)"?It seems strange to have both folders in the root directory without an explanation.Thanks for any insight into this.donmac

The folder named "Program Files (x86)" is where all 32BIT programs should be installed, so FS9 and all programs/addons to go with it. the folder named "Program Files" is where 64BIT programs are installed. This is how I have my x64 XP running and have had no problems with it so far.

>The folder named "Program Files (x86)" is where all 32BIT>programs should be installed, so FS9 and all programs/addons>to go with it. the folder named "Program Files" is where 64BIT>programs are installed. This is how I have my x64 XP running>and have had no problems with it so far. Thanks for that information. I was confused about that particular aspect because MS installed Outlook Express in both folders.Appreciate you taking the time to respond.donmac

I think that is because they include 32 bit and 64 bit versions of Outlook Express and Internet Explorer.

Yes they did, with the default apps that came with XP there is now a 32bit and 64bit version of each.