Normally I wouldn't suggest deletion, however in this case, it can be deleted safely.
- The memory.dmp file is created when your system crashes it contains what is in memory at the time of the crash, which could have contained malware. It could be as large as your memory so may not be allowed to send to the chest without changing the settings.
If you have the tools and experience you can examine this file to help discover why the crash happened, if you don't have this experience and tools, it is worthless to you. The older the file is the less worth it is also.
If windows were to crash again then it would create a new memory.dmp file if one wasn't present or replace any existing one. So there really is no downside to deleting this memory.dmp file.