Occasionally, modders use arbitrary names for compressed assets; for example, Skyrim modders often share .rar archives containing script sources or textures.
Since a .rar file is a compressed archive used to group and shrink files, a file named T27.rar most likely contains one of the following: T27.rar
A personal file named by a user for their own organization, which cannot be identified without the original source. How to Access the Content T27.rar
Your guide to opening RAR files: All you need to know! - Avira T27.rar
To see what is actually inside the file, you must extract it using an archiving tool: