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What is the technical differences for an app running in "XP SP2 Compatibility Mode" on Vista

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Last Modified: 2013-11-25
I have an app which doesn't run right under Vista, but runs fine in Vista with the app running in XP SP2 Compatibility Mode.  What is the technical difference of the XP SP2 mode and running the app normally under Vista?

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As I know, Vista has a 64 bit default length, while XP has only 32 bit, so you need to use the compatibility mode in able to run your application build in windows XP.

Compile your application in Vista, and it will run normally during application loads.

Sorry if I catch it wrong.

Great is our GOD.


Thanks rionroc,

Unfortunately I can't build the app in Vista, the main platform is XP systems.  Also, the bad Vista behavior is the app not being allowed to sqawn processes which the XP SP2 Compatibility Mode allows.  I was looking for how the OS's behavior changes between straight Vista and Vista with the app running in the XP SP2 Compatibility Mode.
Top Expert 2007
Vista has tighter security at the OS level and what is allowed to happen for applications, that's why it works OK in Xp Compat mode.

Vista is built from scratch so there are 100's of major changes, mostly security related.

I hope this helps !

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