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Thank you so much, I just changed \includegraphics{abc.pdf} to \includegraphics{myfiles/abc.pdf} and it worked! So simple! Thanks again, you are awesome!

Ok, the document is my thesis. All chapters (tex files) of the thesis with the abc.pdf file are in one folder called "myfiles" and this folder is in My Documents. The main tex file is outside of this folder but still in My Documents.
The main tex file looks something like this:

\documentclass[11pt ...

Hi,

I'm using TeXnicCenter editor with MikTeX 2.9. I want to insert a PDF page, that I called "abc.pdf", in my PDF document. I opened a folder and called it "myfiles", this is where all my source files and "abc.pdf" are. The code related to "abc.pdf" is the following:
\makeatletter ...