Food for thought ...

You can open .LST and .ASM files in MicroCode Studio, and it even highlights them.
If you have line numbers turned on, View > Editor Options > General tab > Show line numbers in left gutter
It's easy to find things according to the numbers in the error messages.

When opening a file in MCS, change the Files of type: dropdown box to Assembler and List Files (*.asm;*.lst)

Select the View > Editor Options > General tab > Prompt if file reload required option and it will ask to reload the files after a compile of the .pbp program so you're always looking at the most recent version.