I would love to have PDFTK Builder as portable apps.
I would be very easy to create this portable application. As PDFTK Builder consists of just two exe files and one help file.
Putting them into a folder does the trick. The only problem that i'm having is that the PortableAppsMenu sees both exe files. One of the exe files is just a command line utility that is used by the other exe file. It should be visible in the menu.
The software is opensource and can be downloaded from http://www.angusj.com/pdftkb/pdftkb_setup.exe
I know its been quite a while but I think its a cool program and alerady portable so its easy to package.
EDIT Done
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