From: Warren Young
Date: October 22 2007 9:46pm
Subject: Re: myqlpp.dll is not a valid windows image installation problems
List-Archive: http://lists.mysql.com/plusplus/7105
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JJ Harrison wrote:
> 
> "The application or DLL C:\Dev-Cpp\Bin\mysqlpp.dll is not a valid Windows
> image. Please check this against your installation diskette."

I'm assuming you actually built that DLL yourself, as opposed to copying 
it from somewhere?  If so, since MySQL++ has been known to build with 
MinGW -- search the archives -- there may be something wrong with your 
build system.

Also, try removing Dev-Cpp from the equation: build it from the command 
line with just the MinGW tools.