General musings from the MacVector team about sequence analysis, molecular biology, the Mac in general and of course your favorite sequence analysis app for the Mac!

Choosing the default application to open a file type

Sometimes you’ll find that when you double click on a document (for example a protein sequence) that it opens in the wrong application. Generally this has resulted from recently installing a new application that has registered itself as the default application that you normally use to open that document. This will overwrite your default application.

For example you double click on a Genbank sequence file (that has a file extension ending in “.gb”. You expect to see this sequence in MacVector, but instead it opens in some other application.

Here’s how to fix this:

  • 1 – select any of the file type you want to change (e.g the aforementioned Genbank file) and “get info” using CMD + “i” (or right click/hold down CTRL and left click, on the file and choose “get info”).
  • 2 – in the Get Info dialog move to the OPEN WITH section (as in the screenshot below).
  • 3 – Change the drop down menu to
  • 4 – Click the CHANGE ALL button and reply CONTINUE on the dialog that appears.
  • Now close the Get info dialog and double click on a text file. It should now open in TextEdit.

    Screen Shot 2012 02 06 at 18 56 28

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