Could not find rtl_work.TB.vhd

VHDL allows you to package components into libraries.

If you know how to use the tools, then its relatively easy to get libraries working. Since you are letting the tool create scripts for you, its a little harder.

To make your life simpler, just edit the VHDL files with

library ieee_proposed;

use ieee_proposed.fixed_package.all;

and change these two lines into the single line

use work.fixed_package.all;

Then both Quartus and Modelsim will look for all VHDL in the default work library.

Cheers,

Dave