VimTweak is a project mainly written in C, it's free.
The tweaking dll for GVim.exe.
This is a mirror of http://www.vim.org/scripts/script.php?script_id=687
This should work on Win2k (or WinXP maybe)
Alpha Window: 200/255 alpha :call libcallnr("vimtweak.dll", "SetAlpha", 200) reset alpha :call libcallnr("vimtweak.dll", "SetAlpha", 255)
Maximized Window: Enable :call libcallnr("vimtweak.dll", "EnableMaximize", 1) Disable :call libcallnr("vimtweak.dll", "EnableMaximize", 0)
TopMost Window: Enable :call libcallnr("vimtweak.dll", "EnableTopMost", 1) Disable :call libcallnr("vimtweak.dll", "EnableTopMost", 0)