The .7z extension indicates it uses the LZMA or LZMA2 compression algorithms, which typically result in smaller file sizes than standard .zip files. How to Open and Use BLC.7z
To access the contents of a BLC.7z file, you need a compatible file archiver: BLC.7z
It is often found in repositories like BLCM (Borderlands Community Mods) , where it may contain collections of text-based patch files, community patches, or modding tools like the Borderlands Community Mod Manager (BLCMM). BLC.7z