[fRodzet]

local function ChatlinkTooltips_SetOrHookHandler(frame, event, func)
    frame:HookScript(event, func) -- Sets & Hooks the script
end

Worked like a charm, ty However:

local linkType = strmatch(linkData, "|H(.-):")

doesn't seem to work.. and i don't quiet get, why it "should" work either?

string.split(":", linkData) makes also way more sense in my head :P Here is my code so far:

local supportedType = { 
spell = true, 
item = true, 
quest = true, 
achievement = true, 
talent = true, 
glyph = true, 
unit = true,
enchant = true
}
 
local function ChatlinkTooltips_ShowTip(self, linkData)
    local linkType = string.split(":", linkData)
    if supportedType[linkType] then
        GameTooltip:SetOwner(self, "ANCHOR_CURSOR")
        GameTooltip:SetHyperlink(linkData)
        GameTooltip:Show()
    end
end
 
local function ChatlinkTooltips_HideTip()
    GameTooltip:Hide()
end
 
local function ChatlinkTooltips_HookHandler(frame, event, func)
    frame:HookScript(event, func) -- Sets & Hooks the script
end
 
    for i = 1, NUM_CHAT_WINDOWS do
    local frame = _G["ChatFrame" .. i] -- Copy a reference
        ChatlinkTooltips_HookHandler(frame, "OnHyperLinkEnter", ChatlinkTooltips_ShowTip)
        ChatlinkTooltips_HookHandler(frame, "OnHyperLinkLeave", ChatlinkTooltips_HideTip)
end