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.
SteamLibrary\steamapps\common\BorderlandsPreSequel\Binaries\Win32\BorderlandsPreSequel.exe UHD Update Note:
: Check if the file is corrupted by trying to open it with its native application or another compatible viewer/editor. blcmm invalid file selected
: BLCMM was primarily designed for Steam; it often fails to auto-detect or validate the EGS executable.
Open BLCMM strictly to open, edit, and merge your .txt mod files. BLCMM was primarily built for Steam versions
How to Fix the "BLCMM Invalid File Selected" Error in Borderlands Modding
The file is not a valid text-based patch file (e.g., trying to open a .json or .docx file). : BLCMM was primarily designed for Steam; it
: Shorten the file path or rename the file to something simpler if you suspect that the path or name is causing issues.
.../Borderlands 2/Binaries/Win32/Borderlands2.exe