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Windows Server “Shimming Applications for Terminal Services”

When addressing difficult application compatibility issues, there are some things you just can’t fix. Some applications will never work on Windows Vista, shims or no shims.

For example, I was debugging one application that happened to be written in Visual Basic 4.0 16-bit. (Ah, the days when you would pick the bitness in Visual Basic. I had almost forgotten about that!) I was watching it error out with Error 70 – Access Denied and trying to sort out what the problem was. A little help from Process Monitor revealed that there were no file or registry keys that were the cause of the problem. I was next thinking it might be related to COM, when a colleague (whose name rhymes with Orange) suggested looking for windows hooks. Sure enough, a bp on user32!setwindowshookexa turned up a hit, I investigated the arguments, and it was setting up a hook of type WH_JOURNALPLAYBACK.

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Windows, Server, Operating System, Terminal Services, Guide, Knowledgebase, Article

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