.GOOD File

The good file extension is lately also used by several different ransomware, most notably "Scatter" which is infected via Trojan-Ransom.BAT.Scatter.

This particular ransomware encrypts and renames files with the appendix to extension being .crypt, .good or .pzdc.

How to open:

Files affected by "Scatter" can be recovered using ScatterDecryptor utility from Kaspersky.

How to convert:

Not meant to be converted to anything else, at best you can recover the original files.