.LKR File

The lkr file extension is associated with MPLAB, a free Integrated Development Environment (IDE) that contains integrated toolset for the development of embedded applications employing Microchip's PIC and dsPIC microcontrollers.

These lkr files contain linker data.

How to open:

Probably not meant to be accessed by the user.

How to convert:

There is probably no real way how you can convert this particular file type to anything else.