5.2.3   Procedure Files

.hdvp  
This is the default file format for external procedure files. It stores external procedures in XML format and is suitable for revision control software. Procedures with the extension .hdvp always override procedures with the same name but the extension .dvp in the same directory.

.dvp (Legacy)  
This is the default file format for external procedure files in HDevelop versions up to and including HALCON 9. It is not suitable for managing external procedures using revision control software. This format is required if you want to be able to use external procedures in older versions of HDevelop. This format is now marked as legacy and its use is no longer recommended.

The file name (without the extension) determines the name of the contained external procedure (see also section “Procedure Types”).