...There is only a file called "empty" https://imgur.com/a/ee7TaSA
...You need to save the replay after the game. Also, you can save the replay as jpg pictures.Just go to the 'Options' in main menu and choose a checkbox 'Save replays as JPG files'.
For spectromancer's version v1.34 (http://g.recordit.co/yEWa52Q2wK.gif)Maybe, you haven't a file 'Autosave'? Try to create it 'AutoSave.sav".