Could not find rtl_work.TB.vhd

--- Quote Start ---

Sorry, i'm totally overwhelmed by the situation, ho do I know wheter to use the rtl_work or ieee_proposed library since allmost all .vhdl it uses a fixed point number i am using right know use work.fixed_package.all;

--- Quote End ---

Assuming you have edited the VHDL files and *removed* any instances of ieee_proposed and rtl_work, then both Quartus and Modelsim will be looking for compiled VHDL in the work folder. Follow the procedure I outlined above to ensure that none of the files in your Quartus project are being compiled into a library. At that point Quartus should compile the source, and if you launch Modelsim from Quartus, Quartus should generate a Tcl script (.do file) that tells Modelsim to also compile source into the work library.

Cheers,

Dave