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To start off, you'll need to open the Command Prompt, if you don't know how to find it, type "cmd" into the Windows search bar, then click "Command Prompt" to open it. Now, open the folder you have the compressors in; drag "lxz.exe" into the Command Prompt; add a space, type in -d, add a space again, then drag in your param folder(Archive.bin.cmp, located in "param"). Press Enter, then remove the .cmp from the file name.
Open RDLParamGUI, now open your param file, you then can edit various values. Some entries are labelled, most aren't; some things that are probably consistent are the boss values. Entry 0 is Main Mode HP, Entry 1 is Extra Mode HP, Entry 2 is when phase 2 starts in Main Mode, Entry 3 is when phase 2 starts in Extra Mode, lower values mean phase 2 starts later, higher values make phase 2 start sooner.
To compress the file, follow the same steps from before but with -evb and adding .cmp to the end of the file name. Then test out your edits in game.