I made an extractor for Bemani IFS files. It’s been done a few times before, but this one’s reasonably usable compared to “drag and drop one file on this program, which spawns 50 files more, each of which you drag on this program to decompress, then each decompressed file to another program which spits up a window and has you drag a slider around until it looks right.”
Features:
It’s a .NET 2.0 application, and is in the public domain.