A BPL file is a log used by TSR Mobile, an Android and iOS app for managing underground pipe and drilling data. It contains plan information for horizontal directional drilling (HDD) that includes the bore path.

TSR Mobile is developed by Subsite Electronics, which specializes in HDD guidance systems for installing and maintaining underground pipe and cable. One of the main features of TSR Mobile is that it can create reports based on .TSL files, which are drill tracking logs generated by a TK Series HDD Guidance System.

Dynamic-link library (DLL) used by Delphi, a software development application; may contain a run-time package for compiled applications, or may store a component that extends the Delphi IDE; can be shared across multiple projects.

NOTE: The Delphi IDE is now owned and maintained by Embarcadero Technologies.