What is "MapleLegendsCompressed.exe"?

I was curious, so asked in Discord. Putting this on the forums in case anyone else in the future encounters the same curiosity.

"A new "MapleLegendsCompressed" .exe will be made together with "MapleLegends.exe". The difference is that the compressed one is how the .exe was [ a few ] patches ago. Some people encounter emote issues, multiclient issues, or other issues with the regular .exe so you can now use this as alternative if you wish. Client_Backup.zip found in the root MapleLegends directory contains this file too." - Kimmy (discord)​

Any other details that should be included here?

(Sorry for the almost useless guide)