memoQ supports a variety of file formats, and every file format has certain features. Do you want to import the index entries from an INX file? Do you want to import the table of contents in a Word file? Do you want to exclude certain cell ranges in an Excel file? Or import only segments where translate="yes" in an XML file?
Filter configurations allow for fine-tuning your file filters. They are available when you use Import With Options on the Documents ribbon. Once there, click Change filter and configuration to import a document into your project. You can also share your filter configurations with others. This is especially useful with file formats that have lots of options such as XML or Excel.
See also: Help about Document import settings. That topic lists supported file formats, too.