If you are looking at a file or a post with this specific title, here is what the technical terms signify:
.rar or .7z file.Setup.exe: Choose your installation directory. Do not use spaces in the folder name (e.g., use C:\Summer2015 instead of C:\Summer 2015).Apply_Vietsub.bat. Run this as administrator. It will rename the original English script files and replace them with the Vietnamese .rpyc files.Summer2015.exe. If you see Vietnamese text on the title screen, the repack was successful.