Extracting a specific file from an archive using 7-Zip

The man 7z page says:

  -i[r[-|0]]{@listfile|!wildcard}
         Include filenames

You need to explicitly specify ! before the file name and protect the switch from bash expansion with single quotes: 7z x '-i!Windows/System32/BootRec.exe' winRE.wim

xubuntu@xubuntu:~$ 7z x '-i!Windows/System32/BootRec.exe' winRE.wim

7-Zip [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
p7zip Version 9.20 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,4 CPUs)

Processing archive: winRE.wim

Extracting  Windows/System32/BootRec.exe

Everything is Ok

Size:       299008
Compressed: 227817568

(You can avoid keeping the full path by using the e function letter: 7z e '-i!Windows/System32/BootRec.exe' winRE.wim.)

BTW, if you do not protect the -i option with single quotes or protect it with double quotes, you get an error:

xubuntu@xubuntu:~$ 7z x "-i!Windows/System32/BootRec.exe" winRE.wim 
bash: !Windows/System32/BootRec.exe: event not found