Rensenware Encrypted File
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What is a RENSENWARE file?
In 2017, developer Kangjun Heo created rensenWare. Like typical ransomware, rensenWare maliciously encrypts and renames a user's files. Unlike typical ransomware, rensenWare does not ask users to pay a ransom to decrypt their files. Instead, it requires users to achieve a score of 200 million points in the Lunatic difficulty of Touhou Seirensen ~ Undefined Fantastic Object, a scrolling shooter video game. (RensenWare does not include Touhou Seirensen ~ Undefined Fantastic Object, so users had to acquire and install it themselves.)
After accidentally infecting his own computer with rensenWare, Heo created a tool that allows players to automatically set their Touhou Seirensen ~ Undefined Fantastic Object score to 200 million, to terminate the ransomware and restore infected files. Later, Heo iterated on this tool and created a version that does not require users to install or play Touhou Seirensen ~ Undefined Fantastic Object to decrypt their files.
How to open a RENSENWARE file
You can use rensenWare Forcing Tool (Windows) to restore your RENSENWARE files to their original state. To do so, simply download and run rensenWare Forcing Tool (by double-clicking it). The program will then restore your files and terminate the rensenWare process.