If you click on a file and the wrong app opens it, you can change the default application to open that file or file type. These are the steps to both change the default app to open one specific file or to change the default app to open all files of one file type.
Change Default App for One File:
1. Ctrl-click on the file you want to open
2. Click Open with
3. Select Other
4. Select the applcation you want to open the file
5. Select Always Open With
6. Click Open button
Now that one file will always open with the application you picked.
If you want to change the default app that opens all the files of one particular file type, you can do that too.
Change Default App for All Files of a File Type:
1. Ctrl-click on the file
2. Click Get Info
3. Under Open With pick the app that you want to become the default
4. Click the Change All button
5. Confirm your decision