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I've put together a few tips and tweaks in this post that may be useful. Just small stuff that's been coming up in a number of threads. Please feel free to add helpful bits and pieces you've found. :)

Windowed Mode

Yes, the game can be run in windowed mode. In order to enable it, you need to go into your documents folder and open a file named settings.txt (use Notepad or Wordpad, not Word). On a standard Windows installation, it is located at: C:\Users\<Name>\Documents\Paradox Interactive\Crusader Kings II where <name> is your Windows user name. Change the line that says "fullScreen=yes" to "fullScreen=no" (minus the quotation marks) and save. You may want to select a different resolution for this, too.

Performance boosts

If you're running the game on an older computer or a laptop, you may notice some "lag" or low framerates (game feels sluggish). If this the case for you, you can improve the performance by turning off the trees. Open settings.txt in your documents folder (see above for where to find it) and change the line "draw_trees=yes" to "draw_trees=no" (without the quotation marks). You should notice a substantial performance boost.

(You may notice some other options here, but not all of them are actually used by the game. Shadows and bloom, for example, are not currently supported, so turning them on or off will not have an impact on your playing experience.)

Different location for save files and screenshots

By default, the game puts the save files and screenshots into your documents folder (see Windows Mode paragraph above). If you would prefer them to be kept in a different location, you can change this. Here is how:

Go to the location of the actual game files (where the executable is). A common location is C:\Program Files (x86)\Steam\steamapps\common\crusader kings ii. Here, manually create a plain text file named userdir.txt. In this text file, put the path of where you would like the game to put save files and screenshots, e.g. D:\Miscellaneous\CK2stuff\. (You can delete the folder in My Documents and restart the game, it will create its files in the new location.)

IMPORTANT: Before you do this, backup your save games, screenshots, etc, so that nothing is lost!

File Locations on Mac OS X
The executable is in ~/Library/Application Support/Steam/SteamApps/common/Crusader Kings II/ck2.app
The user files (settings.txt, error logs, saved games, gfx) are in Users/<UserName>/Documents/Paradox Interactive/Crusader Kings II/
To see ~/Library/ go to the Finder, hit command-shift-G (ie Go To) and type in ~/Library/ .

File Locations on Linux
Executable, DLCs and Mod upload folder:
/home/user/.steam/steam/SteamApps/common/Crusader Kings II/
The "Documents" equivalent is:
/home/user/.paradoxinteractive/Crusader Kings II/

~/.local/share/Paradox Interactive/Crusader Kings II

How to find the local copy of your Cloud savegames (whether Ironman or not):

C:/Program Files (x86)/Steam/userdata/<YOUR STEAM ID>/203770/remote/save games/

How to access and delete your saved games in the Steam Cloud:

Custom resolutions

CK2's engine allows you to create a custom resolution, which for example would be useful if you want to emulate a borderless window mode (not directly supported) or double the text size without making everything look too blurry. This can be simply done by opening the settings.txt file (see above for where to find it) and changing the "x" and "y" variables near the top of the file. "x" is the width and "y" is the height. Note that the smallest supported values are 1024 (for "x") and 768 (for "y"). (Kudos to ewphoenix123 for this tip!)
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DLC names and numbers

DLCs reside in the program files area (in Steam this is under Steam/SteamApps/Common/Crusader Kings II/DLC/) as two files for each DLC; dlc001.zip and dlc001.dlc . The .zip file contains the actual data, images or songs; the .dlc file is a simple text file that can be read with Notepad or Textapp and contains the title of the DLC as below.

001 Dynasty Coat of Arms Pack 1
002 Mongol Face Pack
003 Songs of Albion
004 Songs of Faith
005 Ruler Designer
006 Songs of the Holy Land
007 The Sword of Islam
008 African Unit Pack
009 Songs of the Caliph
010 Dynasty Coat of Arms Pack 2
011 Legacy of Rome
012 Byzantine Unit Pack
013 African Portraits
014 Mediterranean Portraits
015 Russian Unit Pack
016 Russian Portraits
017 Songs of Byzantium
018 Sunset Invasion
019 Songs of the Rus
020 Norse Portraits
021 Norse Unit Pack
022 The Republic
023 Songs of Prosperity
024 The Old Gods
025 Hymns to the Old Gods

027 Celtic Unit Pack
028 Celtic Portraits
029 Dynasty Coat of Arms Pack 3
030 Europa Universalis IV Converter
031 Customisation
032 Sons of Abraham
033 Military Orders Unit Pack
034 Warriors of Faith Unit Pack
035 Hymns of Abraham
036 Songs of Yuletide
037 Saxon Unit Pack
038 Finno-Ugric Unit Pack
039 Rajas of India
040 Turkish Unit Pack
041 Turkish Portraits
042 Songs of India
043 Persian Unit Pack
044 Persian Portraits
045 Charlemagne
046 Early Western Clothing Pack
047 Early Eastern Clothing Pack
048 Dynasty Shields Charlemagne

050 Way of Life
051 Iberian Unit Pack
052 Iberian Portraits

054 Horse Lords
055 Mongol Unit Pack
056 Songs of the Steppes
057 Cuman Portraits
058 Early Frankish Unit Pack
059 Early Germanic Unit Pack
060 Italian Unit Pack
061 Orchestral House Lords (sic)

062 Conclave
063 Conclave Content Pack
064 Viking Metal
065 South Indian Portraits

066 The Reaper's Due
067 The Reaper's Due Content Pack
068 Full Plate Metal Music Pack

069 Monks and Mystics
070 Monks and Mystics Content Pack
071 Hymns of Revelation
072 South Indian Portraits 5 Year Anniversary Gift

073 Jade Dragon

074 Holy Fury
075 PDX CON 2018 Emblems Pack
076 Pagan Fury Music Pack

Bolded underlined entries are major DLCs . Others are "cosmetic", that is they do not affect gameplay at all.
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