Copy the content of several text files into one file

Hi Experts,

I have created a text file containing the full path to several text files.

Sample from file called copylist.txt:

C:\test\ifdata.txt
C:\test2\ifdata.txt
C:\test3\ifdata.txt
C:\test46\ifdata.txt
C:\test45\ifdata.txt
C:\test48\ifdata.txt
C:\test64\ifdata.txt

As you can see, all files have the same name, but are located in different folders, and have different content.

What I need to do is to copy the content of all these files into one large text file.

Ideas?

Thanks,
Bjorn