Once all metadata (references, retained sizes, etc.) for a heapdump are computed, the corresponding hwcache folder contains the following files:

NBProfiler.nphd
NBProfiler<number>.map
NBProfiler<number>.ref

However, on Windows there's an extra .gc file in this folder:

NBProfiler.nphd
NBProfiler<number>.gc
NBProfiler<number>.ref
NBProfiler<number>.map

Based on the implementation details, this file is not needed and should be deleted.