how to make a file relative to $VIM

Hi,

I can make a directory relative to $VIM with this command
set bdir=$VIM/vimfiles/backup

I can make a file location with an absolute path available bij saying:
let MRU_File = 'C:\vim\_vim_mru_files'

How can I make a file location relative to $VIM?
let MRU_File = "$VIM/_vim_mru_files"'doesn't seem to work

Rgds,
Jeri

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