You can fix all your file extensions by using registry easy.

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A .wmz file is a compressed Zip archive that contains a Windows Media Player skin definition file and associated Jscript files and its supporting graphic files.
WMZ file is a Windows Media Player skin file which is an XML text document that defines the elements that are present in a skin.
WMZ files are used to change [...]

File created by Microsoft Project, a program for organizing, tracking, and maintaining projects; controls workloads, schedules, finances, etc; contains a timeline, a list of tasks, and other project information.
Microsoft Project (or MSP) is a project management software program developed and sold by Microsoft which is designed to assist project managers in developing plans, assigning resources [...]

ASPX pages are also called “.NET Web forms;” they can be identified in a Web browser when the URL in the address field ends in “.aspx”.
Micrososft ASP.NET script used to create dynamicaly generated websites and webpage content.
To execute an ASPX file or VBScript, it must be contained within its host environment. This means the Windows [...]

It can be real easy to fix file extensions with the right software. Software that makes it so easy you can just point and click and the problems are fixed. I recommed RegistryEasy easy to use and fixs the problem immediatly. Download it free today!

Registry Easy – An Award Winning And Helpful Registry Repair Tool For Your Windows
Often, installation and un-installation of programs leave behind certain fragments such as corrupted drivers, strayed startup tasks and orphaned files. One must have observed that the longer he has utilized his computer system, the slower it operates and more it hangs or [...]

PDF is probably one of the most common document file you can find on the internet after HTML. Lots of government forms and applications are stored in this format.
“Portable Document Format” was created by Adobe Systems in 1993 to facilitate document exchange. After creation of the internet this format experienced significant growth and became de-facto [...]

The DMG format replaces the older .IMG file format, which is used in Mac OS Classic and is not compatible with Mac OS 9 and earlier; DMG disk images can be opened using the Applie Disk Utility that is bundled with Mac OS X on Apple computers.
DMG is a mountable disk image file created in [...]

Here you will find information on repairing all your file extension problems. You will find definitions of many different file extensions here.