Rafael,
Go to the "Toolbox" Tab of Prospector > Reports Manager > Alignment > Rt. Click on PI Station Report > Execute (see below).
Before running the report, change the file output type, by selecting the File folder icon on lower right of dialog and change the "saveas type" from html to (*.XLS).
This sends the report directly to an Excel file.
C3D 2018.1
C3D 2016 SP4
Win 7 Professional 64 Bit