A quicky: if you need to merge multiple text files into one new file in Windows, you can use
copy on the cmd.exe command-line:
On your Windows
cmd.exe command-line, use the following command to merge all text files in a directory into one new file:
copy /b *.log newfile.log
copy /a *.txt newfile.txt
/b indicate ASCII text or BINARY files.
This is ideal for combining multiple log files into one file for LogParser and log forensics.