When MAME 0.185 and 0.186 were released, the emulator stopped relying on sound simulations and started demanding this specific file. This caused thousands of global users' game libraries to "break" overnight with a "dl-1425.bin NOT FOUND" error.
The file must be contained within a zip file named for the most recent versions of MAME (v0.200 and later). dl1425bin qsoundzip updated download
Reliable versions of this updated BIOS are often found in "Merged ROM" sets on archival sites like Archive.org . Summary of Recommended Steps When MAME 0