Just like many other popular file extensions, you can also have details about File extension bup and file extension wmv from the free file formats library of file-Extension.com. Let’s have a look

File extension .bup

Different software use the .bup file extension as a back up of the IFO file available in DVDs. With the help of IFO file, different information can be stored on the DVD, including tracks or subtitles. If the primary IFO file gets corrupted or unavailable, you can use the backup file.  BUP files can be accessed through media player and it is not necessary to open them directly.  

If Windows is not opening BUP files, it is possible that you have registry related error or may have not installed the appropriate program. For related errors, it is recommended to run a free registry scan.

File extension .wmv

Microsoft created .WMV file extension format as an alternative to Real Player’s format and that’s why .WMV file extension is associated with Microsoft. The .WMV file extension is used to store and stream compressed audio and video files. You can open .WMV files by using the Microsoft Media Player, but you must scan your system to avoid and identify associated errors.

Aside from file extension .bup or .wmv , you can have a detailed database of many popular file extensions like file extension bin and file extension torrent. This free online file extension library provides information related to fixation of file extension errors.
   
A precise outline of the function and nature of file extension is somewhat difficult to define and the over 40 years computer hardware and software developments and competing influences of Windows/DOS, Unix and Mac, which all have different file systems and metadata formats were the basic hurdle in this connection.

It was Digital Equipment Corporation that first implemented file extension early in 1960s. Digital Equipment Corporation used to break a file system along with the name of the file extensions.  Then, Microsoft used the same pattern in its DOS as well as in Windows operating system after a long time. Microsoft expressed file extension and base name as single name that was separated by a full stop.  It wasn’t more than a convention to demonstrate that different information together. In DOS, file extension was separately stored from the base name and Microsoft originally restricted the base name to just eight characters and extension to three characters. 

While on the other hand, UNIX and Mac operating systems both had their own file systems and they didn’t use file extension. In Mac OSX, the data was stored through code contained within the file. These days Mac OXS are also using file extension, but it is largely accepted that the prevalence of Windows developed the standard method of showing a file’s function known as file extension.

The author writes on File Extension .bup and File Extension .wmv.