If you're interested in playing PS1 games on your PS3, consider the following alternatives:

Copy the .pkg files directly to the of the USB drive (not inside any folders).

If you have a stock, unmodified PS3:

A .pkg file is the standard package file format used by the PlayStation 3 to install apps and games. While the PS3 can natively emulate PS1 discs, converting these games into offers several advantages:

A is a digital package format used by the PlayStation 3 to install games, updates, and applications. When you convert a PS1 game (originally in BIN/CUE or ISO format) into a PKG file, the PS3 treats it exactly like an official PlayStation Network (PSN) digital release. Why Use PKG Format instead of Discs or ISOs?

To proceed, your console must be modified. There are two primary methods: