A file extension is an optional alphanumeric identifier which comes after the last found period in a file name. A file extension itself does not define what type of data is in a file, but it does give a hint as to what is *supposed* to be in the file.

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Mac OS X 10.5 show suffix default

Does anybody know how you can make files show their suffix on default in finder. Currently I have to open the info window for each file and deselect "Hide extension". Greetings elhombre
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How can I make locate/updatedb ignore certain file extensions?

For instance, I don't want either program to find files that end in *.pyc. I'm sure I can do this somehow using regexes or globs, but is there a way to make locate just ignore the files altogether? ...
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How do you remove a default program association for file types in Windows 7?

I somehow have set the default file type association for a file type in Windows 7. It doesn't appear to be possible to delete it from the "Change the file type associated with a file extension" ...
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1answer
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What should the .help file extension be registered to on OS X?

I recently got a package of .help manual files for a device. Unfortunately, some gremlin has decided these files should open with "Disk Inventory X", which gets thrown into an absolute transport by ...
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Any tool available to make renaming in Windows XP more like Mac OS X?

I've noticed 1 cool thing and OS X. When you rename a file, it automatically selects everything up until the extension. For example, attempting to rename this.is.a.file.png would preselect this.is.a....