Microsoft products save their files in proprietary formats (e.g. Word will save as .doc or .docx in later versions)
Libre Office will open these quite happily, but saves its files in a different format and filetype (not .doc(x) for the Word equivalent).
It is quite easy to change this behaviour within Libre Office settings, so it will save in MS Office formats and file types, but it isn't the default.
It is generally better to change the default setting to output MS formats, especially if you exchange files with other MS Office users.
A one-off edit for the settings is sufficient and easy, but from recollection, you may need to do it for each of the components (word processing, spreadsheet, etc.)
Without adjusting the defaults, there is a workaround on saving each document, simply choose save as, rather than save, and it will give you an option of file format to save as (e.g. Word 2007)
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Word Processing Software? 
Word Processing Software? 
