Just so you know, we don't know the file format for every file. If it's just a bunch of random characters, it's probably a .zip or .jar.

# ################################################################

# Chat Items

# This script allows players to put items from their inventory in chat. You can also put
# multiple items in chat by specifying a slot between 1 and 36. 

# WORKS WITH ANY ITEM

# Made by AsuDev
# Date: 2/6/20

# Requires skript-mirror 2.0 / skquery

# NOTICE

# If you are using Skript 2.3.7 or LOWER, you do not need to change anything.
# If you are using Skript 2.3.7 or HIGHER, you need to comment out line 171 and uncomment line 172!

# ################################################################

# OPTIONS / IMPORTS

option ver:
	get:
		return console.getServer().getClass().getPackage().getName().split("\.")[3]

import:
	org.bukkit.inventory.ItemStack
	net.minecraft.server.{@ver}.ChatComponentText
	org.bukkit.craftbukkit.{@ver}.inventory.CraftItemStack
	java.lang.String as St
	java.util.UUID

options:

	# PERMISSION OPTIONS

	# Require sharing items in chat to have permission 'chatitems.share'
	useItemChatPermission: false

	# CHAT OPTIONS

	# The amount of items a player can put in chat
	allowedOccurencesOfItem: 3
	# Capitalize uncapitalized item names for items that do not have a name
	capitalizeItemNames: true
	# Removes underscores and replace with spaces
	replaceUnderScoresWithSpaces: true
	# The original chat color so it reformats itself after adding an item
	originalChatColor: &f
	# Default item color for items that do not have a name
	defaultItemColor: &7
	# Bracket color
	defaultBracketColor: &7
	# Item tooltip when hovering over items in chat
	hoverItemTooltip: %{_defaultItemColor}%%{_n}%%nl%&7Click to view this item.
	# Show item stack amount in chat
	showStackAmount: true
	# Item stack in chat format
	amountFormat: &7x%{_amount}%


	# GUI OPTIONS

	# Display item gui name
	guiDisplayItemName: &a%arg 1%'s Display Item
	# Gui size (rows)
	guiSize: 1
	# Item slot
	itemGuiSlot: 4

on skript start:
	set {item-counter} to 1
	delete {item-displays::*}
	set {hidden-id} to UUID.randomUUID().toString()

on script load:
	{item-counter} is not set
	set {item-counter} to 1
	delete {item-displays::*}
	set {hidden-id} to UUID.randomUUID().toString()	

# ################################################################

# FUNCTIONS

function replaceUnderScoresWithSpaces(s: string) :: string:
	replace all "_" with " " in {_s}
	return {_s}

function capitalizeItemNames(s: string) :: string:
	set {_s::*} to {_s} split by " "
	loop {_s::*}:
		set {_sub} to ""
		set {_sub} to subtext of loop-value from 2 to length of loop-value
		set {_s::%loop-index%} to "%first character of loop-value in upper case%%{_sub}%"
	return join {_s::*} by " "

# COMMANDS

# This command should not be used normally, only for chat.
command /viewitem [<text>] [<text>] [<integer>]:
	trigger:
		if arg 1 is not set:
			stop
		if arg 2 is not {hidden-id}:
			stop
		if {item-displays::%arg 3%} is not set:
			message "&cThat preview item no longer exists."
			stop
		set metadata value "Item-Gui" of player to "true"
		open chest with {@guiSize} rows named "{@guiDisplayItemName}" to player
		wait 1 ticks
		set slot {@itemGuiSlot} of player's current inventory to {item-displays::%arg 3%}

# HIGHLY RECOMMENDED TO CLEAR CHAT AFTER RESET!
command /resetchatitems:
	trigger:
		if player has permission "chatitems.admin":
			delete {item-counter} and {item-displays::*}
			message "&7Chat items have been completely reset."
		else:
			message "&cYou do not have permission to do this."

# ################################################################

# EVENTS

# Main chat event
on chat:
	if message contains "[item-" or "[i-":
		if {@useItemChatPermission} is true:
			if player does not have permission "chatitems.share":
				stop
		if event is not cancelled:
			cancel event
			if event.getFormat() contains "%%":
				set {_s} to St.format(event.getFormat(), player.getDisplayName(), message)
			else:
				set {_s} to event.getFormat()
			set {_counter} to 0
			set {_defaultItemColor} to "{@defaultItemColor}"
			set {_subtexts::*} to {_s} split by " "
			loop {_subtexts::*}:
				delete {_failed} and {_n} and {_amount}
				if {_counter} is {@allowedOccurencesOfItem}:
					stop 1 loop
				if loop-value contains "[item-" or "[i-":
					set {_c} to loop-value
					replace all "[item-" and "[i-" and "slot" and "sl" and "s" and "]" with "" in {_c}
					set {_c} to "%{_c}%" parsed as integer
					if {_c} is not a integer:
						set {_failed} to true
					if {_c} is not between 1 and 36:
						set {_failed} to true
					if slot {_c}-1 of player's inventory is air:
						set {_failed} to true
					{_failed} is not set
					set {_i} to slot {_c}-1 of player's inventory
					if {@showStackAmount} is not true:
						set {_i} to 1 of {_i}
					add {_i} to {item-displays::*}
					set {_n} to name of {_i}
					if {_n} is not set:
						set {_n} to "%type of {_i}%"
						if {@replaceUnderScoresWithSpaces} is true:
							set {_n} to replaceUnderScoresWithSpaces({_n})
						if {@capitalizeItemNames} is true:
							set {_n} to capitalizeItemNames({_n})
						replace all " Item" and "Item" with "" in {_n}
					if {@showStackAmount} is true:
						set {_amount} to {_i}.getAmount()
						set {_n} to "{@amountFormat} {@defaultItemColor}%{_n}%"
					set {_subtexts::%loop-index%} to "<tooltip:{@hoverItemTooltip}><cmd:/viewitem %player% %{hidden-id}% %{item-counter}%>{@defaultBracketColor}[{@defaultItemColor}%{_n}%{@defaultBracketColor}]&r{@originalChatColor}"
					add 1 to {_counter} and {item-counter}
			set {_s} to join {_subtexts::*} by " "
		send "%{_s}%" to all players # For versions under 2.3.7
		#send formatted "%{_s}%" to all players # For versions 2.3.7+
		send "%St.format(event.getFormat(), player.getDisplayName(), message)%" to console

on inventory click:
	metadata value "Item-Gui" of player is set
	cancel event

on inventory close:
	metadata value "Item-Gui" of player is set
	clear metadata value "Item-Gui" of player

# ################################################################