The latest version of Wii Backup Manager shouldn't need to be installed; I run Build 78 straight from the EXE file and have the whole folder stored as a Portable Application.
What this Application does is scan your specified Folder for all the ISO and WBFS Files it can recognise, with the option of turning the former into the latter. It also allows for downloading of CD Covers which it can include automatically into Flash Drives that you copy the WBFS into, specifically targetting the format needed by the Wii Emulator you're going to run it on, mine being USB Loader GX.
So, back to your question, theoretically, this Application can scan your WBFS and if it doesn't recognise it, that will be a sure sign said file is corrupted.