AP3 file format is a VS10XX VSOS App from Asprova – an APS (Advanced Planning and Scheduling) system for Microsoft Windows OS. In short, it saves the scheduling project created via Asprova. Naturally, other apps can use files with .ap3 extensions. Just be cautious with AP3 data from unknown sources.
WMA (Windows Media Audio) is a collection of multiple sound codecs and their respective coding formats. It was developed by Microsoft in 1999 as part of its Windows Media framework. WMA features up to four codecs, including WMA, WMA Pro, WMA Lossless, and WMA Voice. Each codec has its own distinct function.
VLC Media Player Winamp Zune Software Media Player Classic