Title: Windows Media Video
Content:  The audio format used in conjunction with Windows Media Video is typically some version of Windows Media Audio, or in rarer cases, the deprecated Sipro ACELP.net audio format. Microsoft recommends that ASF files containing non-Windows Media formats use the generic .ASF file extension.
Title: MPEG-4 Part 14
Content: MPEG-4 files with audio and video generally use the standard .mp4 extension. ; Audio-only MPEG-4 files generally have a .m4a extension. This is especially true of unprotected content. ; MPEG-4 files with audio streams encrypted by FairPlay Digital Rights Management as were sold through the iTunes Store use the .m4p extension. iTunes Plus tracks, that the iTunes Store currently sells, are unencrypted and use .m4a accordingly. ; Audiobook and podcast files, which also contain metadata including chapter markers, images, and hyperlinks, can use the extension .m4a, but more commonly use the .m4b extension. ; The Apple iPhone uses MPEG-4 audio for its ringtones but uses the .m4r extension rather than the .m4a extension. ; Raw MPEG-4 Visual 
Title: MPEG-1
Content:  .mpg is one of a number of file extensions for MPEG-1 or MPEG-2 audio and video compression. MPEG-1 Part 2 video is rare nowadays, and this extension typically refers to an MPEG program stream (defined in MPEG-1 and MPEG-2) or MPEG transport stream (defined in MPEG-2). Other suffixes such as .m2ts also exist specifying the precise container, in this case MPEG-2 TS, but this has little relevance to MPEG-1 media. .mp3 is the most common extension for files containing MP3 audio (typically MPEG-1 Audio, sometimes MPEG-2 Audio). An MP3 file is typically an uncontained stream of raw audio; the conventional way to tag MP3 files is by writing data to "garbage" segments of each frame, which preserve the media information but are discarded by the player. This is similar in many respects to how raw .AAC files are tagged (but this is less supported nowadays, e.g. iTunes). Note that although it would apply, .mpg does not normally append raw AAC or AAC in MPEG-2 Part 7 Containers. The .aac extension normally denotes these audio files.
Title: Windows Media Player
Content:  player) or other mobile devices, and enable users to purchase or rent music from a number of online music stores. Windows Media Player replaced an earlier application called Media Player, adding features beyond simple video or audio playback. Windows Media Player 11 is available for Windows XP and included in Windows Vista and Windows Server 2008. The default file formats are Windows Media Video (WMV), Windows Media Audio (WMA), and Advanced Systems Format (ASF), and its own XML based playlist format called Windows Playlist (WPL). The player is also able to utilize a digital rights management service in the form of Windows Media DRM. Windows Media Player 12 is the most recent version of Windows Media Player. 
Title: Windows Media Audio
Content:   Windows Media Audio 9 Lossless is a lossless incarnation of Windows Media Audio, an audio codec by Microsoft, released in early 2003. It compresses an audio CD to a range of 206 to 411 MB, at bit rates of 470 to 940 kbit/s. The result is a bit-for-bit duplicate of the original audio file; in other words, the audio quality on the CD will be the same as the file when played back. WMA Lossless uses the same .WMA file extension as other Windows Media Audio formats. It supports 6 discrete channels and up to 24-bit/96 kHz lossless audio. The format has never 
Title: Portable media player
Content:  Nearly all players are compatible with the MP3 audio format, and many others support Windows Media Audio (WMA), Advanced Audio Coding (AAC) and WAV. Some players are compatible with open-source formats like Ogg Vorbis and the Free Lossless Audio Codec (FLAC). Audio files purchased from online stores may include digital rights management (DRM) copy protection, which many modern players support.
Title: Windows Media Player Playlist
Content:  WPL (Windows Media Player Playlist) is a computer file format that stores multimedia playlists. It is a proprietary file format used in Microsoft Windows Media Player versions 9–12. The elements of WPL files are represented in XML format. The top-level element,, specifies that the file's elements follow the SMIL (Synchronized Multimedia Integration Language) structure. The file is saved with the "wpl" filename extension and its MIME type is application/vnd.ms-wpl.
Title: Media Foundation
Content:  Windows Media Audio and Windows Media Video are the only default supported formats for encoding through Media Foundation in Windows Vista. For decoding, an MP3 file source is available in Windows Vista to read MP3 streams but an MP3 file sink to output MP3 is only available in Windows 7. Format support is extensible however; developers can add support for other formats by writing encoder/decoder MFTs and/or custom media sources/media sinks. Windows 7 expands upon the codec support available in Windows Vista. It includes AVI, WAV, AAC/ADTS file sources to read the respective formats, an MPEG-4 file source to read MP4, M4A, M4V, MP4V, MOV and 3GP container formats and an MPEG-4 file sink to output to MP4 format. Similar to Windows Vista, transcoding (encoding) support is not exposed through any built-in Windows application but several codecs are included as Media Foundation 
Title: Windows Voice Recorder
Content:  Before Windows 7, Sound Recorder could save the recorded audio in waveform audio (.wav) container files. Sound Recorder could also open and play existing .wav files. To successfully open compressed .wav files in Sound Recorder, the audio codec used by the file must be installed in the Audio Compression Manager (ACM); Windows installations dating back to at least Windows 95 came with a selection of standard codecs that included Truespeech, GSM 6.10, G.723.1, IMA ADPCM and CCITT A-law and u-law, with additional codecs being added in later editions. Starting with Windows Vista, Sound Recorder saves recorded audio in Windows Media Audio (.wma) files instead; the exceptions to this are the Home Basic N and Business N editions, which continue to use .wav. Also, audio metadata such as Artist, Album, Title, and Genre can be added to the sound file directly while saving the file. Voice Recorder in Windows 10 only records audio in MPEG-4 Part 14 (.m4a) container formats.
Title: Audio Interchange File Format
Content:  file is also an AIFF-C/sowt. In all cases, Apple refers to the files simply as "AIFF", and uses the ".aiff" extension. For the vast majority of users this technical situation is completely unnoticeable and irrelevant. The sound quality of standard AIFF and AIFF-C/sowt are identical, and the data can be converted back and forth without loss. Users of older audio applications, however, may find that an AIFF-C/sowt file will not play, or will prompt the user to convert the format on opening, or will play as static. All traditional AIFF and AIFF-C files continue to work normally on macOS (including on the new Intel-based hardware), and many third-party audio applications as well as hardware continue to use the standard AIFF big-endian byte order.

Question: which is the default file extension for an audio file in windows media player?
Answer: Windows Playlist (WPL).