Don't rename files, it will get you in trouble. Just make a file called 1.bat which has this in it:
dash-qt.exe -wallet=1.dat
and another called 2.bat
dash-qt.exe -wallet=2.dat
etc.
Then run 1.bat or 2.bat or...
ummm ok, I don't what this means. I'm not a tech guy. Is there a way to install one wallet to one folder link to the .dat file in that one folder?
Edit: Im installing the wallets on a single windows PC.
Ok,
1) Make a shortcut for dash-qt.exe
2) Right-click, go to properties, and where it says target:, add after the "(filename)" -wallet=wallet1.dat
"C:\Program Files\Dash\dash-qt.exe" -wallet=wallet1.dat
This shortcut will create a new wallet file named wallet1.dat and use that one every time, repeat these 2 steps with a different -wallet=(name).dat, to create new shortcuts to your wallet(s)