That is 3528.rar にはDLKeyが設定されています
COMMENT[DLKey]
DATE21/08/31(Tue),23:36:17
SIZE27.5MB (28863748bytes)
ORGMIMEapplication/octet-stream
ORGNAMEDev 19.rar
DLKey:

That's ローダーに戻る