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I tried using mt.exe [from MS Visual Studio] to manifest my files. It worked on some but not on others. It seems your method of parsing the .EXE is more robust than the one that mt.exe uses. 
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UAC Manifest Tool: Application Makeover
Incorporate Application Manifest with Trust Level Information Section into Your Applications.
Another neat feature of Resource Tuner is its ability to generate a so-called application UAC manifest. This is a recently-introduced extension to Microsoft's common controls library, which enables an application to make use of the visual styles found in Windows XP and Vista. The Windows Vista application manifest has been enhanced with attributes that permit developers to mark their applications with a requested execution level.
The wizard allows you to add a TrustInfo section and insert the Require Administrator information into it so that the application would be forced to run elevated as an Administrator on Windows Vista, providing the application the same operational behavior as in Windows XP. A modified exe should still work correctly on prior Windows operating systems.
Here is how the common controls for an ordinary application look on Windows XP before and after a manifest has been inserted:
If you want to make an application visual-style savvy and you don't have the source code, you normally have to place a specially-named .XML file in the same directory as the executable. Resource Tuner provides a better solution by enabling you to inject the needed resource directly into the EXE file in just a few clicks:
Resource Tuner adds in a manifest file into a manifest resource within the resource section of the EXE file. And now you could easily convert your legacy Delphi, Visual Basic, Visual C, etc. application into a Windows Vista-like application.
The Manifest Wizard allows your application to take advantage of the new common control styles and appearances featured in Windows XP and Vista. Just run the wizard to slip an application manifest into the resource section of the executable. The wizard is very easy to use. There are two fields to fill out, application name and description, from which the wizard generates a visual style manifest for your application.
Add a manifest to the executable declaring a requested Execution Level:
After generating the manifest, the wizard embeds the manifest in the executable as a resource and makes the necessary adjustments to the PE file image.
Once the Wizard has completed creating the manifest, the newly created manifest resource appears in the Resource TreeView:
Give Resource Tuner a trial run for 30 days free! Once you try it, we think you will find it hard to go back to other resource hacking utilities. So if you decide to purchase it, it's only $39.95 for a Personal License. A Business license is available for $79.95.