Navigate to your game's installation directory (usually found under Steam\steamapps\common\Borderlands 2\Binaries\Win32 ).
Simply replace the old BLCMM.jar or .exe file with the new one. Summary Table: Troubleshooting "Invalid File Selected" Potential Cause Ensure you are opening .blcm or .txt , not .zip . No "steam" in folder path Move/Rename game folder to include ...\Steam\Borderlands2 . Corrupt Mod File Redownload the mod from a trusted source. Hex Edit Failed Use Hex MultiTool to manually patch the .exe . Outdated BLCMM Download the latest BLCMM version. Still Having Trouble?
The is an essential tool for modding Borderlands 2 , The Pre-Sequel, and sometimes BL1, allowing players to merge mods, apply the Unofficial Community Patch (UCP), and customize their experience. However, a common frustration users encounter is the "BLCMM invalid file selected" error.
The error "invalid file selected" is a catch-all response. It means that the file you attempted to open does not match the expected schema, the file header is corrupted, or the file extension is misleading. In essence, BLCMM looked inside the file and found data it could not parse.
: The legacy version of BLCMM requires manual Java dependencies and fails to read modern game updates. How to Fix "BLCMM Invalid File Selected" 1. Trick the Path Using a "Steam" Folder blcmm invalid file selected
Download the standalone from trusted community hubs like Nexus Mods.
If you are using the , the loading mechanism changes. BLCMM is primarily for text-based mods (patch.txt method).
OpenBLCMM is completely separate from the original BLCMM. You can have both installed, and they won't interfere with each other.
Right-click your game executable ( Borderlands2.exe ) and select . Uncheck the Read-only box at the bottom, then click Apply . No "steam" in folder path Move/Rename game folder to include
To ensure you never see the "invalid file selected" error again, follow this exact workflow:
Often, the mod text file you are trying to use was not saved correctly.
Open the mod .txt file. It should look like computer code (e.g., set ... , BLC ... ). If you see HTML code, website errors, or garbled text, the file is corrupt. 5. Check for "Read-Only" Protection If the file is locked, BLCMM cannot process it. Right-click the .txt file →right arrow Properties →right arrow Uncheck "Read-only" →right arrow Alternative Solutions: OpenBLCMM
Version compatibility is critical. If you are running BLCMM version 1.x and trying to open a mod built with version 2.x (or vice versa), the schema may have changed. The current standard is . Outdated BLCMM Download the latest BLCMM version
: Mod files should typically be placed in your game's Binaries folder (e.g., \SteamLibrary\steamapps\common\Borderlands 2\Binaries\ ) or saved there directly through BLCMM's shortcuts.
Follow these sequential methods to solve the file-selection lock and return to managing your mods. Method 1: Target the Precise Win32 / Binaries Folder
This happens when BLCMM expects a properly formatted mod file but finds something else — for example: