Reserved file and URI scheme names

You can use URI associations to automatically launch your app when another app launches a specific URI scheme. But there are some URI associations that you can’t use because they are reserved. If your app registers for a reserved association, that registration will be ignored. This topic lists the reserved file and URI scheme names that are not available to your app.

Reserved file types

There are two types of reserved file types: file types reserved for built-in apps and file types reserved for the operating system. When a file type reserved for a built-in app is launched, only the built-in app will launch. Any attempt to register your app with that file type is ignored. Similarly, any attempt to register your app with a file type reserved for the operating system also will be ignored.

File types reserved for built-in apps

.aac	.icon	.pem	.wdp
.aetx	.jpeg	.png	.wmv
.asf	.jxr	.pptm	.xap
.bmp	.m4a	.pptx	.xht
.cer	.m4r	.qcp	.xhtml
.dotm	.m4v	.rtf	.xltm
.dotx	.mov	.tif	.xltx
.gif	.mp3	.tiff	.xml
.hdp	.mp4	.txt	.xsl
.htm	.one	.url	.zip
.html	.onetoc2	.vcf
.ico	.p7b	.wav

 

File types reserved for the operating system

The following file types are reserved for the operating system

.accountpicture-ms	its	.ops	.url
.ade	.jar	.pcd	.vb
.adp	.js	.pif	.vbe
.app	.jse	.pl	.vbp
.appx	.ksh	.plg	.vbs
.application	.lnk	.plsc	.vhd
.appref-ms	.mad	.prf	.vhdx
.asp	.maf	.prg	.vsmacros
.bas	.mag	.printerexport	.vsw
.bat	.mam	.provxml	.webpnp
.cab	.maq	.ps1	.ws
.chm	.mar	.ps1xml	.wsc
.cmd	.mas	.ps2	.wsf
.cnt	.mat	.ps2xml	.wsh
.com	.mau	.psc1	.xaml
.cpf	.mav	.psc2	.xdp
.cpl	.maw	.psm1	.xip
.crd	.mcf	.pst	.xnk
.crds	.mda	.pvw
.crt	.mdb	.py
.csh	.mde	.pyc
.der	.mdt	.pyo
.dll	.mdw	.rb
.drv	.mdz	.rbw
.exe	.msc	.rdp
.fxp	.msh	.reg
.fon	.msh1	.rgu
.gadget	.msh1xml	.scf
.grp	.msh2	.scr
.hlp	.msh2xml	.shb
.hme	.mshxml	.shs
.hpj	.msi	.sys
.hta	.msp	.theme
.inf	.mst	.tmp
.ins	.msu	.tsk
.isp	.ocx	.ttf

Reserved URI scheme names

application.manifest	inffile	ms-settings:network-dialup	scrfile
application.reference	insfile	ms-settings:network-ethernet	scriptletfile
batfile	internetshortcut	ms-settings:network-mobilehotspot	shbfile
bing	javascript	ms-settings:network-proxy	shcmdfile
blob	jscript	ms-settings:network-wifi	shsfile
callto	jsefile	ms-settings:nfctransactions	smb
cerfile	ldap	ms-settings:notifications	stickynotes
chm.file	lnkfile	ms-settings:personalization	sysfile
cmdfile	mailto	ms-settings:privacy-calendar	tel
comfile	maps	ms-settings:privacy-contacts	telnet
cplfile	microsoft.powershellscript.1	ms-settings:privacy-customdevices	tn3270
dllfile	ms-accountpictureprovider	ms-settings:privacy-feedback	ttffile
drvfile	ms-appdata	ms-settings:privacy-location	unknown
dtmf	ms-appx	ms-settings:privacy-messaging	usertileprovider
exefile	ms-autoplay	ms-settings:privacy-microphone	vbefile
explorer.assocactionid.burnselection	ms-excel	ms-settings:privacy-speechtyping	vbscript
explorer.assocactionid.closesession	msi.package	ms-settings:privacy-webcam	vbsfile
explorer.assocactionid.erasedisc	msi.patch	ms-settings:proximity	wallet
explorer.assocactionid.zipselection	ms-powerpoint	ms-settings:regionlanguage	windows.gadget
explorer.assocprotocol.search-ms	ms-settings	ms-settings:screenrotation	windowsmediacenterapp
explorer.burnselection	ms-settings:batterysaver	ms-settings:speech	windowsmediacenterssl
explorer.burnselectionexplorer.closesession	ms-settings:batterysaver-settings	ms-settings:storagesense	windowsmediacenterweb
explorer.closesession	ms-settings:batterysaver-usagedetails	ms-settings:windowsupdate	wmp11.assocprotocol.mms
explorer.erasedisc	ms-settings:bluetooth	ms-settings:workplace	wsffile
explorer.zipselection	ms-settings:connecteddevices	ms-windows-store	wsfile
file	ms-settings:cortanasearch	ms-word	wshfile
fonfile	ms-settings:datasense	ocxfile	xbls
hlpfile	ms-settings:dateandtime	office	zune
htafile	ms-settings:display	onenote
http	ms-settings:lockscreen	piffile
https	ms-settings:maps	regfile
iehistory	ms-settings:network-airplanemode	res
ierss	ms-settings:network-cellular	rlogin