Always backup your save folder before applying any third-party unlockers. If you are concerned about security, you can open the .rpy files with a text editor (like Notepad++) to ensure no malicious "web-requests" or "file-deletion" commands are present in the script.
This file, is a community-made "mod" or patch designed for the adult-oriented game A House in the Rift . AHouseInTheRift-0.5.12r2-GalleryUnlocker.zip
When dealing with "Gallery Unlockers" or "Cheat Patches" from unofficial sources, you should be aware of the following: Always backup your save folder before applying any