If you plan on having more than one alternative prefix, I'd recommend keeping a directory of prefixes (e.g.,
~/.wine/wineprefix/<nameofprefix>). In your case of only needing one prefix, let's call our alternative wineprefix "
WINEPREFIX=~/.wine-w-wmp wine winecfg
The wineprefix part tells the
wine program which virtual drive to use.
wine winecfg is the actual command, which will bring up the virtual drive's configuration. However, winecfg will notice that no virtual drive exists at this new location and will create one. Wine "bottles"/"wineprefixes" and "virtual drives" are used interchangeably--they refer to a new instance of
wine, like separate computers with their own setup. So this is your clean wineprefix.
In your case, to install Windows Media Player 10, download it from their website, and if the file is in your Downloads folder, run:
WINEPREFIX=~/.wine-w-wmp wine ~/Downloads/MP10Setup.exe
Then install as usual.
If you're planning to type
WINEPREFIX=<directory of prefix> at the start of each wine command, you might want to just set that wineprefix as the default. (When run without "WINEPREFIX=",
wine looks to its default wineprefix at
~/.wine.) To change the default (at least until your next restart), run:
export WINEPREFIX=~/.wine-w-wmp <or the directory of your prefix>
(If you want this command to stick between new Terminal instances, add the above line to your
~/.bashrc and then run
source ~/.bashrc to reload the file in your current instance.)