You probably received an audio or video file in a format that the computer does not recognize, because it does not have the respective codecs or readers, something that happens with some formats recorded on smartphones, such as m4a. Before you complain that the file is corrupt, you can test convert it quickly on the Online-Convert website, a dashboard full of converters for many of the most popular formats, without having to install anything on your computer.
The system supports more than 30 converters, divided into 12 categories, including audio (MP3, AAC, WAV, MMA), video (AVI, WMV, MP4, WEBM), image (JPEG, TIF, GIF, etc.), documents (DOC, HTML, TXT, DOCX). The website also includes converting PDF documents to images in JPG format or Word documents, as well as compression files such as ZIP and 7Z.
Perhaps one of the most interesting features is the optimization of files for social networks, such as Facebook, Instagram, Twitter and others. When choosing the social network, you will be able to release videos and choose which preset you want, be it the format (a mp4 or gif), the resolutions of the same and other very simple settings, which it converts and quickly downloads the file to the computer. Does Twitter sometimes not recognize the video file you want to submit? The tool does this conversion quickly.