Skyrim Special Edition save filenames clearly have useful information in them in a specific format.
This information can be handy e.g. when going back through the save game history to decide which saves to keep and which to dump, since a directory full of multi-megabyte saved games can get very large.
Here are some example filenames:
Autosave3_74DD6D56_1_42617469737465_KnifepointRidge01_000521_20171125110855_3_1.ess
Quicksave0_74DD6D56_1_42617469737465_KnifepointRidge01_000527_20171125111521_4_1.ess
Save1_AC6950AD_1_507269736F6E6572_Tamriel_000006_20171125005247_1_1.ess
What do the various components mean?
Feel free to update the community answer if you have only a little extra information to add.
Best Answer
Save filenames have nine components separated by underscores. Examples:
The components are:
[0] Save Slot
One of
Quicksave0
,Autosave{1,2,3}
orSave{1,2,3,...}
.[1] Racemenu hash
Unique hash used to identify your save profile. Regenerated on closing racemenu.
[2] Flag for modded game
0 for unmodded, 1 for modded.
[3] Character name in hex
Use a site like this one to convert. Examples:
42617469737465
is Batiste507269736F6E6572
is Prisoner[4] Location
A textual location name (with CamelCase words, no spaces) sometimes followed by a two digit number.
Examples:
Tamriel
,HelgenKeep01
,HalfMoonMill
,KnifepointRidge01
.[5] Days, Hours, Minutes played
Format is DDHHMM.
[6] Timestamp
Format is YYMMDDHHMMSS.
[7] Level
Current level of character. Variable digits, not padded.
[8] Unknown Number
Examples:
1
.Credit to NQS NamedQuicksaves for some of the above information.