Running Mavericks, I was trying to get messages to run ICQ and apparently I changed a setting that now causes me to get an error message and shuts messages down.

I am running Mavericks.
I was trying to get "Messages" to play nice with ICQ. it was sending HTML format to the receiver on the other end.
I saw online how to change the item typed to show up as plain text on the for the recipient.
Unwisely, I didn't follow ALL the instructions (where it told me to make a copy on my desktop "in case" and I changed one of the settings incorrectly.
Now when I try to start Messages up, it opens briefly, then says it encountered an error and needs to shut down.
I can remove Messages, but before I do, I can't seem to find a place to re-download it.
Any suggestions on the best way of handling this?

Hi,
Once you get to Lion (OS X 10.7) and higher the only way is to Restore the whole OS as several Apple App are included this way and are not available separately.
It should be just the .plists that are involved.
The com.apple.imagent.plist holds the account info as it provides a "listening" function on all logins before your start up the app.
I would delete this one as well.
If that does not work repeat the process and delete com.apple.ichat.plist itself.
7:20 pm      Monday; March 24, 2014
​  iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

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