List of filename extensions / Q

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This list contains common file name extensions that are used in some operating systems to differentiate between file formats . In other operating systems, file type identification is mainly carried out using the file header, and the MIME type is more important than the file name extension for e-mail attachments . Systems that use the latter two approaches usually ignore the extension completely.

Filename extension MIME type Full name Remarks, usage
.qb Q uick B ASIC QuickBASIC program code file
.qdb CUEcards database Notes management
.qcd Quicknote encrypted text Encrypted note from Quicknote
.qdr Q-Dir Document text Open note from Q-Dir.exe
.qt Quicktime files (* .mov, * .qt) version 1 and 2 Apple QuickTime file format
.qti image / x-quicktime QuickTime Image Image format from Apple QuickTime
.qti image / x-quicktime QtiPlot QtiPlot project file
.qtl QuickTime Media Link Information about the media to be played for the QuickTime Player
.qua AntiVir / Avira quarantine File infected with malware in the quarantine directory
.qvd QlikView QlikView data file
.qvs QlikView QlikView script file
.qvw QlikView QlikView application file, usually with script, imported data and layout
.qxd QuarkXPress Document: Document format from QuarkXPress up to and including version 5
.qxl QuarkXPress Library: QuarkXPress library file
.qxp QuarkXPress Project: QuarkXPress version 6 or higher document format that bundles different QXDs in one project
.qxt QuarkXPress template: QuarkXPress template document