LibreCrypt: Open-Source disk encryption for Windows

Technical Details: Filename Extensions

LibreCrypt container files, keyfiles, and all other files created and used by LibreCrypt can have *any* file extension you wish to give them (if any).

By default, LibreCrypt uses the following:

Extension	Description
.vol	Volume file (container)
.cdb	Keyfile (aka Critical Data Block)
.cdbBackup	Critical Data Block Backup