.PBO File Extension
File TypePacked Bohemia Object
What is a PBO file?
Data file used by several Bohemia Interactive games; may contain mission data, campaigns, or add-ons; saved as a package that includes multiple files.
NOTE: PBO files are used by several Bohemia Interactive games and are not meant to be opened manually. However, the contents of a PBO file can be viewed and edited using a PBO viewer such as ArmA Tools' cpbo utility.