If your game is installed elsewhere (e.g., a custom folder or Epic Games), create a new folder named steam within your game directory.
Using an outdated version of BLCMM or trying to use FilterTool files in BLCMM (though they are usually compatible). How to Fix "BLCMM Invalid File Selected" Follow these steps in order to resolve the issue. 1. Re-download or Re-save the Mod File
With patience and the guidance provided in this article, you should be well-equipped to resolve any "invalid file selected" error and dive back into the chaotic, loot-filled world of Borderlands with your favorite mods fully operational.
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. blcmm invalid file selected
Instead of forcing BLCMM to "accept" the file, veteran modders use a two-step workaround:
If you'd like, I can provide more specific instructions for: Using BLCMM with the Python SDK Mod Loader Fixing specific "invalid file" errors for Borderlands 3 Let me know which of these would be most helpful! Share public link
The primary causes can be broken down into three categories: (like missing Java or incorrect file paths), administrative issues (like lack of permissions), and compatibility issues (especially with game updates or different game launchers). If your game is installed elsewhere (e
BLCMM primarily recognizes and standard text .txt files.
BLCMM’s built-in hex-editing functionality has been broken for several years and often fails to recognize updated versions of the game.
BLCMM relies on the Java Runtime Environment (JRE) to run. If Java is missing, outdated, or incorrectly installed, BLCMM may not start at all or may produce unexpected errors when loading files. The Unofficial Community Patch (UCP) FAQ explicitly states that Java 8 is required to use BLCMM. Ensure your Steam Library (and specifically the Borderlands
If the error is specific to one mod file:
: Standard BLCMM has not been updated to support newer game versions, leading to detection failures. Encrypted/Protected Executables
The file is not a valid text-based patch file (e.g., trying to open a .json or .docx file).