Adding a section to a PE executable at runtime

Hey all,

I want to add a new 'section' of code to a PE executable. I'll redirect the entry point of the .exe to the new section so that I can run code before the application starts running (No, I'm not writing a virus :)). I've written a little tool which should be able to do this: It adds an entry into the section table, writes out the new section (Padded out to and aligned on the FileAlignment size), and updates ImageSize (ie. RoundUpToSectionAlignment( Sections[lastsection].VirtualAddress+Sections[lastsection].VirtualSize) ). But Windows chokes on the .exe, giving "My program.exe is not a valid Win32 application".

The modified .exe looks kosher in PEBrowse professional. How can I figure out why Windows is rejecting my .exe?

Cheers,
Nicholas Sherlock

--
http://www.sherlocksoftware.org
.

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