If you haven’t found it yet, YES, you can read the .laccdb (database lock file) created by a database when it is locked. This file does not read in a text editor, you need to access it with other means.
So what is the .laccdb file? When a database is opened, Access automatically creates a lock file matching the file name, but with an extension of .laccdb instead of .accdb (the old file format was .ldb / .mdb). The file is used to track who is editing the database…problems happen when someone does not exit the database clean, or you have a large multi user environment with many users sharing a database. You may need to either remove the .laccdb file or find out who is in the database.
There is an excellent tool to do this created by my fellow Access MVP Brent Spaulding (the Zeus of Access by my mythology book). You can find that tool online, or email me for assistance! No more calling users on their phones to find out if they are still in the database to install that critical patch you wrote last night!
For more info on the tool check out this post!