You can delete those files
Those files are part of the post-installation process that lists the customizations and/or 3rd party plugins that were active at the time the software was installed.
Are your contacts safe?
All contacts are stored in a SQLite database. The fact the showed up on your Desktop might warrant a bug report. Preferences are likely stored in a binary plist format. Therefore you‘ll need a tool like
plistbuddy. Just keep that in mind.
Can I remove?
So, is it safe to remove? The biggest issue will be if you contact support and the ask for the file, you won’t have it to give to a (tech) support person starting from scratch. Other than that, you’re free to move, delete, open, etc. with no risk.