FLAC and OGG Vorbis are audio file formats, which have advantages over WAV/AIFF and MP3.
FLAC is smaller than WAV or AIFF and its container format supports metadata by default, which benefits keeping track of authorship and license in large sound collections.
FLAC is lossless, while MP3 always has a loss of quality. Also MP3 does not support rates over 48000. Both is hard to notice but can become very relevant when manipulating the sound file.
OGG Vorbis is of higher quality than MP3 and is a patent-free format, which is important to software/hardware makers. FLAC is also patent-free.
Unfortunately, some software developers and hardware manufacturers still exclude FLAC and/or OGG Vorbis support.
I recommend the free, open source Linux/Mac/Windows Audacity software to solve compatibility problems and convert files.
If you can find the time, please contact the developer of your software/manufacturer of your hardware, informing them of the need for FLAC and/org OGG Vorbis support to be able to quickly work with the format.