I require additional information in order to assist you better.
What is the file extension you are trying to associate?
A default program is the program that Windows uses when you open a particular type of file, such as a music file, an image, or a webpage. For example, if you have more than one web browser installed on your computer, you can choose one of them to be the default browser.
Use this option to choose which programs you want Windows to use, by default.
If a program does not show up in the list, you can make the program a default by using Set Associations.
1. Open Default Programs by clicking the Start button, and then clicking Default Programs.
2. Click Associate a file type or protocol with a program.
3. Click the file type or protocol that you want the program to act as the default for.
4. Click Change program.
5. Click the program that you want to use as the default for the file type you selected, or click the arrow next to
Other Programs to show additional programs. (If you don't see
Other Programs, or your program
is not listed,
click Browse to find the program you want to use, and then click Open
For more details follow the link below:
Try creating a new user account and check whether you have the same issue.To create a user account
1. To open User Accounts, click the Start button, click Control Panel, click User Accounts and Family Safety, and then click User Accounts.
2. Click Manage another account. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
3. Click Create a new account.
4. Type the name you want to give the user account, click an account type, and then click Create Account.
For more information follow the link below:
If it works in the new user account, then the user account may be corrupted.
To fix the corrupted user profile you may refer the link below:
Hope this information is helpful.
Microsoft Answers Support Engineer
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Xandragnis helped us as well; the path to the application was not registered correctly for some reason. Wonder if there is a way to check all the app paths in Computer\HKEY_CLASSES_ROOT\Applications rather than manually? Also running x64. Thanks Xandragnis! Peace.Actually this most often happens when you have an earlier version of the program and you upgrade. Like from Photoshop 7 to Photoshop CS3. The uninstaller does not remove the registry keys like it should.
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