.KDMP File Extension

Memory dump saved to a file by Windows; contains a snapshot of the kernel mode portion of a given user mode process; used for debugging applications; may be created on Windows or Windows CE systems.

KDMP files may be contained within a .CAB file, along with .MDMP, .HDMP, and other files. They can be analyzed using WinDbg, which is part of Microsoft's free "Debugging Tools for Windows" suite.