Windows 8.1 - Is the C:\ $AV_NLL folder \ $VAULT \ vault.db file created by Norton ?

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Issue abstract:
Windows 8.1 - Is the C:\ $AV_NLL folder \ $VAULT \ vault.db file created by Norton ?
Is it safe to delete it ?
Is it some sort of backup file for Norton or Norton Password Manager ?

Detailed description:
This file was created at approx. same date & time I installed Norton 360 on my laptop

Product & version number: Norton 360 Deluxe

OS details:Windows 8.1

What is the error message you are seeing? None

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