Browse Tools Top 100

What is .AQQ ?

19k+ file extensions explained, verified on real systems and kept up to date - since 2014.

Trending now: .AQQ.CRDOWNLOAD.PART.DAT.EXE
Drop any file here or browse read locally · nothing is uploaded

Identify an unknown file in one second

Analyzed in your browser. The file never leaves your device - no upload, no server.
Real signature check. We compare magic bytes against 1,900 known formats - renamed files can't hide.
Instant answer. Format name, safety notes and programs that open it.

File of the day

October 6, 2026
.PKG
macOS Installer Package
System Files
updated Aug 26, 2026

The .pkg extension is used, among others, within the macOS operating system, developed by Apple. .pkg files contain packages of compressed installer files with the XAR internal format, whose purpose is to install an application on Mac computers. .pkg files…

SIGNATURE78617221"xar!" - XAR archive header (macOS flat package)
OPENS ONLinuxMac OSmacOSWindows
See full details

Browse by category

All categories
1k+Game FilesOBB, PAK, ROFL, PACKAGE… 1k+Data FilesPKPASS, DAT, JSON, RIS… 1k+Settings FilesICA, DS_STORE, WMZ, CFG… 1k+Developer FilesDO, MD, HEX, XSD… 771Audio FilesOPUS, M3U, M3U8, WFP… 6213D Image FilesDCM, STEP, SKP, STP… 546Video FilesDAV, MKV, MP4, H264… 522Raster Image FilesJPG, PNG, TIF, ECW… 440Text FilesDOC, ODT, DOCX, GDOC…

Popular conversions

All conversion guides
.AVI .MPGOnline converter .AVI .VOBOnline converter .AVI .MPEGOnline converter .MPG .MPEGOnline converter .MPG .MOVOnline converter .EMF .TIFOnline converter
The database at a glance

File formats, the programs that open them and how to convert between them - with the technical details in one place. Browse everything →

19k+extensions
13k+programs
16k+conversions