qview ingests .lbl files as cubelists, causing them not to be ingested.
qview currently treats any file that does not have a .cub or .cube extension as a cubelist and attempts to ingest it as such.
This makes .lbl uningestable because it will read it as a cubelist and throw errors immediately.
The code for this is located in Workspace.cpp
qview should ingest a filename and attempt to open it as a cube, if it can't then it should attempt to ingest it as a cubelist, and if that fails then an error should be thrown.