Convert the mod manually or use OpenHotfix or PythonSDK for BL3/Wonderlands.
: Standard BLCMM has not been updated in years and often fails to recognize newer versions of Borderlands 2 (such as the Commander Lilith DLC update). blcmm invalid file selected
✅ – Should be .blcm or mod .txt ✅ Ensure it’s not a savegame – Save files go in Documents/My Games/Borderlands X/SaveData/ ✅ Verify file integrity – Try opening with Notepad; first line should look like <MCMod> or #Mod ✅ Redownload – Source file may be incomplete ✅ Use latest BLCMM – Older versions may reject newer mod formats Convert the mod manually or use OpenHotfix or
If you have tried all seven fixes above and BLCMM still rejects your file, consider the following last resorts: Steps to Fix the Error Use OpenBLCMM (Recommended)
(specifically 64-bit for modern systems) to run correctly; without a proper installation, file selection can glitch. Steps to Fix the Error Use OpenBLCMM (Recommended)
The most frequent cause of this error is attempting to open a file format that BLCMM does not recognize. Historically, Borderlands mods were distributed as .txt files. However, BLCMM introduced a specialized .blcmm format to handle complex patching and hotfix structures more efficiently. If a user downloads a mod that is still in a raw text format—or attempts to open a file that is simply not a mod file, such as an image or a document—BLCMM will reject it. The solution here is simple: check the file extension. If it is a .txt file, it may need to be imported differently, or converted using a text editor if it adheres to the older standard. Conversely, if the file is confirmed to be a .blcmm file but still fails to open, the file may have been corrupted during the download process. Re-downloading the mod from a trusted source, such as the official GitHub repositories or modding Discord servers, often resolves this immediately.
Point BLCMM to the new path (e.g., .../Games/Borderlands 2/steam/Binaries/Win32/Borderlands2.exe ). 2. Use the Borderlands Hex Multitool