The title says it all. Currently, when you have autosave replays enabled for RetroLemmini, the replay that is generated uses the following filename naming scheme:
Level Pack Name_rank name_level number_Level name_time stamp_date
Yea, autosaved RetroLemmini replays generated this way are way too long IMO. Often times, a lot of the replay filename won't be displayed and hence you would need to mouse over it and/or right-click the file and click Properties.
So, my suggestion would be to provide some other naming schemes when an autosave replay is generated in addition to the one that's currently used for the feature. For example, in NL the level pack folder is made with an Auto folder inside it where the replay resides. In particular, I use NL's autosave rank and level number for my replays. I would certainly use this same naming scheme for RetroLemmini autosave replays if there is such an option :)