You can complete or skip any mission in GTA: Liberty City Stories with this save. These saves only work on GTA Liberty City Beta 3.0.1, which is actually a mod for GTA San Andreas.
Usage: There are 6 missions. Extract any mission you want to complete. Once extracted, copy the save file and go to the documents section and paste this save file into "GTA San Andreas User Files". Now load the game and you will see that the mission is complete. You can watch the video on my channel.