Because you are dealing with a file, you need specialized software to access its contents. Below is a guide on how to handle this specific file type and the technology behind it. 1. How to Open a .7z File
The file is a compressed archive containing a specific digital product, likely an ASMR or audio work , from the Japanese digital marketplace DLsite . The "RJ" prefix is the standard product ID format for that platform. RJ140155.7z
Compressed archives are a common way to hide malicious scripts. Always scan the file with updated antivirus software before extracting. Because you are dealing with a file, you