Since the times of Operation Flashpoint, they used so-called prefix files to provide the packaging tools the information regarding the headers a packed PBO should have.
To use a prefix file, you create a text file with the name i.e. $pboprefix$ (or pboprefix.txt) and some text. And when the PBO Manager packs the folder, the produced PBO will have the header with the name prefix and the text from the file.
The PBO Manager supports the following prefix files (names are case-insensitive):
| File name | Alternative file name | Resulting PBO header |
|---|---|---|
| pboprefix.txt | prefix | |
| pboproduct.txt | product | |
| pboversion.txt | version |
However, there is a more efficient way to control file headers: pbo.json.