INTRODUCTION
Project preset files used by Adobe for Premiere Elements trace back to and are installed on the computer hard drive (Windows 7, 8, 8.1, and 10 64 bit). These files have the file extension of .sqpreset (for versions 8.0/8.0.1 through 14/14.1) and .prpreset (versions 7 and 4). The .sqpreset file can be used as is or edited with Notepad to create customized project presets. Refer to prior related blog posts here
PE11: Exporting a 1080p50 or 1080p60 file with 5.1 Channel Audio
http://atr935.blogspot.com/2013/04/pe11-exporting-1080p50-or-1080p60-file.html
PE11: Exporting a 1080p25 or 1080p30 file with 5.1 Channel Audio
http://atr935.blogspot.com/2013/07/pe11-exporting-1080p25-or-1080p30-file.html
PE12: Exporting a 720p50 or 720p60 file with 5.1 Channel Audio
http://atr935.blogspot.com/2013/10/pe12-exporting-720p50-or-720p60-file.html
PE12: Project Preset with 21:9 Display Aspect Ratio
http://atr935.blogspot.com/2014/08/pe12-project-preset-with-219-display.html
PE12/12.1: 480 x 480p30 Project Preset
http://atr935.blogspot.com/2015/12/pe-12121-480-x-480p30-project-preset.html
Also refer to my replies on this matter in the following Adobe Forum thread
https://forums.adobe.com/thread/480309
ISSUE
Where are these .sqpreset and .prpreset files installed on the computer hard drive during installation of the the various Premiere Elements versions on Windows 7, 8, 8.1, or 10 64 bit?
SOLUTION
For Premiere Elements 10 through 14/14.1 on Windows 7, 8, 8.1, or 10 64 bit, the project preset files have the file extension of .sqpreset and are found in the path of
Local Disk C\Program Files\Adobe\Adobe Premiere Elements (version number)\Settings/SequencePresets\
For Premiere Elements 8.0/8.0.1 and 9.0/9.01 on Windows 7, 8, 8.1, or 10 64 bit, the project preset files have the file extension of .sqpreset and are found in the path of
Local Disk C\Program Files (x86)\Adobe\Adobe Premiere Elements (version number)\Settings\SequencePresets)\
For Premiere Elements 7 and 4 on Windows 7, 8, 8.1, or 10 64 bit, the project preset files have the file extension of .prpreset and are found in the path of
Local Disk C\Program Files (x86)\Adobe\Adobe Premiere Elements (version number)\Settings\en_US (or folder in the Settings Folder corresponding to program language choice)\
ATR