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This is a modified copy of the sticky thread with a similar title from CK2. Please point out any errors or additions below.
File Locations on Windows
The default location for the executables (eu4.exe and eu4_launch.exe and DLCs) is in C:/Program Files/Steam/SteamApps/common/Europa Universalis IV/ .
The user files (settings.txt, error logs, saved games, gfx, mods) are in C:\Users\USER\Documents\Paradox Interactive\Europa Universalis IV\
File Locations on Mac OS X
The executable and DLC folder are in Users/USER/Library/Application Support/Steam/SteamApps/common/Europa Universalis IV/
On OS X 10.8.x and later, Apple have hidden the /Users/USER/Library/ folder. To see it go to the Finder, hit command-shift-G (ie Go To) and type in ~/Library/ .
The user files (settings.txt, error logs, saved games, gfx, mods) are in /Users/USER/Documents/Paradox Interactive/Europa Universalis IV/ .
File Locations on Linux
The binary and DLC folder by default are in ~/.steam/steam/SteamApps/common/Europa\ Universalis\ IV/
Since the 1.12 patch the user files (settings.txt, error logs, saved games, gfx, mods) are now in .local/share/Paradox\ Interactive/Europa\ Universalis\ IV/ , not in /home/$USER/.paradoxinteractive/Europa\ Universalis\ IV/ any more.
If you run a CK2 savegame export, then that will appear in .local/share/Paradox\ Interactive/Crusader\ Kings\ II/eu4_export/mod
Where to find a local copy of your Cloud saves:
C:\Program Files (x86)\Steam\userdata\\236850\remote\save games
How to clear out your Steam Cloud save space:
http://gaming.stackexchange.com/que...ck-way-to-delete-saves-off-of-the-steam-cloud
Delivery of eBooks
eBooks connected with PDS games are delivered by Steam as .mobi and .epub files into the game files, they are NOT available within the Steam client itself at all. The folder they end up in is:
\Steam\SteamApps\common\Europa Universalis IV\ebook
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 Textedit.app, not Word). 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.
Custom resolutions
EU4'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!)
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 may be able to improve the performance by disabling various graphical options. Open settings.txt in your documents folder (see above for where to find it) and change lines to read as below (you should experiment with these, not all will necessarily help and some will reduce map features).
Code:
Note that EU4 is less forgiving than CK2 for under-spec video cards in particular. If none of the above helps you can try any of the low-res mods in the EU3 User Mods forum; also is it presumed and hoped that Paradox will further optimise EU4 performance in upcoming patches (1.1.3 was just release at the time of writing this, so after that). There is no known fix or workaround just yet for the month-start hesitations, nor for the autosave lag in Ironman mode.
Different location for save files and screenshots
By default, the game puts the save files and screenshots into your Documents folder (see 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). 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:\Games\EU4User\. (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 Windows
The default location for the executables (eu4.exe and eu4_launch.exe and DLCs) is in C:/Program Files/Steam/SteamApps/common/Europa Universalis IV/ .
The user files (settings.txt, error logs, saved games, gfx, mods) are in C:\Users\USER\Documents\Paradox Interactive\Europa Universalis IV\
File Locations on Mac OS X
The executable and DLC folder are in Users/USER/Library/Application Support/Steam/SteamApps/common/Europa Universalis IV/
On OS X 10.8.x and later, Apple have hidden the /Users/USER/Library/ folder. To see it go to the Finder, hit command-shift-G (ie Go To) and type in ~/Library/ .
The user files (settings.txt, error logs, saved games, gfx, mods) are in /Users/USER/Documents/Paradox Interactive/Europa Universalis IV/ .
File Locations on Linux
The binary and DLC folder by default are in ~/.steam/steam/SteamApps/common/Europa\ Universalis\ IV/
Since the 1.12 patch the user files (settings.txt, error logs, saved games, gfx, mods) are now in .local/share/Paradox\ Interactive/Europa\ Universalis\ IV/ , not in /home/$USER/.paradoxinteractive/Europa\ Universalis\ IV/ any more.
If you run a CK2 savegame export, then that will appear in .local/share/Paradox\ Interactive/Crusader\ Kings\ II/eu4_export/mod
Where to find a local copy of your Cloud saves:
C:\Program Files (x86)\Steam\userdata\\236850\remote\save games
How to clear out your Steam Cloud save space:
http://gaming.stackexchange.com/que...ck-way-to-delete-saves-off-of-the-steam-cloud
Delivery of eBooks
eBooks connected with PDS games are delivered by Steam as .mobi and .epub files into the game files, they are NOT available within the Steam client itself at all. The folder they end up in is:
\Steam\SteamApps\common\Europa Universalis IV\ebook
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 Textedit.app, not Word). 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.
Custom resolutions
EU4'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!)
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 may be able to improve the performance by disabling various graphical options. Open settings.txt in your documents folder (see above for where to find it) and change lines to read as below (you should experiment with these, not all will necessarily help and some will reduce map features).
Code:
force_pow2_textures=no
draw_trees=no
draw_postfx=no
draw_hires_terrain=no
draw_citysprawl=no
draw_shadows=no
draw_reflections=no
draw_ambient_objects=noNote that EU4 is less forgiving than CK2 for under-spec video cards in particular. If none of the above helps you can try any of the low-res mods in the EU3 User Mods forum; also is it presumed and hoped that Paradox will further optimise EU4 performance in upcoming patches (1.1.3 was just release at the time of writing this, so after that). There is no known fix or workaround just yet for the month-start hesitations, nor for the autosave lag in Ironman mode.
Different location for save files and screenshots
By default, the game puts the save files and screenshots into your Documents folder (see 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). 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:\Games\EU4User\. (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!