EurekaLog stores settings in .eof files. .eof file is a UTF-8 encoded text ini-file, which can be edited in any text editor, or in specialized Settings Editor tool, included with EurekaLog.
EurekaLog stores base project settings in file with same name as project file. For example, if you have Project1.dpr - then EurekaLog will save base settings into Project1.eof file. Such file will be used by default in all cases (compilation from IDE, from command-line, etc.).
Additionally, you may manually create individual settings for each build configuration. For example: Project1_Debug.eof. See Different EurekaLog settings for Debug and Release build configurations for more information.
Note: you may create additional (external) settings.
Any .eof-file different from base (Project1.eof) or configuration-specific (Project1_Debug.eof) is considered to be external settings. Default folder for saving external .eof files (i.e. folder for "Import settings" and "Export settings" dialogs) is %AppData%\Neos Eureka S.r.l\EurekaLog\Profiles\ (e.g. like C:\Users\UserName\AppData\Roaming\Neos Eureka S.r.l\EurekaLog\Profiles\). Any .eof file placed in that location will appear as "custom" project type.
"Project type" option shows two .eof files
.eof files outside of the above mentioned folder will not appear in "Project type" option. For example, base settings of your project (Project1.eof) will never appear as a custom profile.
Apart from %AppData%\Neos Eureka S.r.l\EurekaLog\Profiles\ folder, a typical places to store external .eof files are folder (or sub-folder) of your project.