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 BLCMM 2.x.
The Fix:
If the issue persists after these steps, it is likely a permission issue. Ensure your Steam Library (and specifically the Borderlands game folder) is not located in Program Files (x86), as Windows User Account Control (UAC) frequently blocks BLCMM from writing the necessary files, resulting in invalid file errors.
The "BLCMM Invalid File Selected" error is a common stumbling block for Borderlands 2
and The Pre-Sequel modders, typically occurring when the Borderlands Community Mod Manager (BLCMM) fails to recognize or access the game's executable (.exe) file. Why the Error Occurs blcmm invalid file selected
The error usually stems from one of three primary environmental issues:
Version Mismatch: BLCMM was primarily built for Steam versions. It often fails to auto-detect the Epic Games Store version or the UHD (4K) update version because their file structures or executable signatures differ from the original Steam release.
Path Requirements: BLCMM sometimes hard-codes a search for the word "steam" within the file path. If your game is installed in a custom directory (e.g., C:\Games\BL2), the manager may reject it even if you point directly to the correct file.
Permissions & Quarantine: Antivirus software (like Kaspersky) sometimes flags the modified game executable as a threat, preventing BLCMM from writing to or reading it. Proven Fixes Version compatibility is critical
If you encounter this error while attempting to hex-edit your game files through BLCMM, try these community-verified workarounds:
Use the Standalone Hex MultitoolBecause BLCMM’s internal hex-editing feature is often broken by game updates, experts recommend using the Borderlands Hex Multitool by c0dycode. Use this tool specifically to enable the console and mods, then use BLCMM solely for merging and managing the .txt mod files.
The "Steam" Path TrickIf the manager refuses to accept your file path, try creating a dummy folder structure. Move your game files or create a path that includes a folder named "steam" (e.g., .../Games/steam/Borderlands 2/). Many users find that simply having that string in the directory allows BLCMM to "validate" the file.
Manual Executable MappingInstead of relying on "Auto-detect," navigate manually to the Binaries folder. The Fix: If the issue persists after these
Correct Path: .../Borderlands 2/Binaries/Win32/Borderlands2.exe
Ensure you are selecting the actual game executable, not the launcher.
Epic Games Store WorkaroundSince BLCMM may not natively recognize the Epic executable, some users create a "dummy" Steam path and copy the Epic .exe into it just to let the manager process the file, then move it back. Summary of Alternatives
BLCMM creates a file association for the .blcm extension.