Question: I am using Notepad++ on my Windows machine and by mistake I opened a 64MB file. Now my Notepad++ is stuck permanently and I am not able to use it.

Is there any configuration file which Notepad++ uses to maintain the list of opened files? If yes, then can I open that file and remove the entry of the 64MB file which I have opened in it?

Answer: 
One more thing to add here. The Old Session.xml file would have links to all the files that were open there (File Paths). They should match for the New PC. The User Name, Program Files folder (32bit or 64bit) etc should be the same. Else Notepad++ will open a blank session.
You can also find out directly from Notepad++ and change where it stores this vital information. As mentioned in this [answer](https://stackoverflow.com/questions/29617349/notepad-cached-files-location#29635535) look in Settings > Preferences > Backup: Backup path. There are also other useful settings such as backup frequency.

You can also find session.xml which shows information on the temporary, unsaved files in its parent directory.