basics about current compression tools ?

[joekkerr]

by dll files i mean, i saw some screenshots of people here of their freearc folder which had all other compressors/precompressors (pzlib,precomp,xtool,srep,etc)
I assume the arc.ini has the COMMANDS/OPERATIONS for these tools, then the batch file is used to call arc.exe which carries out the compression using those tools & commands specified in arc.ini <- correct me if i'm wrong

cls-srep.dll

This, the CLS things...what is it ? i assumed its used when using Inno setup, but i plan on using traditional batch file.

what does cls means ? i know what is srep.

yes i think so cuz we use unarc.dll

how ? basically it should be only the executable (cz thats what i've been doing for years
eg. i compressed files in archive 'data.arc'
so my batch will have

arc.exe x data.arc >nul

I never packed the dll with the repack and yet it decompresses fine

Are you implying all the method you mention is used in inno setup ? like you pack with compression tools then tie it together with inno and while decompressing inno can just use libraries (dll) not the exe's ?