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Likewise, a legitimate-looking PDF file (with a PDF icon) downloaded to your Mac could turn into a malicious executable file with an. Unless you know the specific developer, you could contact one of these developers for assistance. For example, a harmless-looking file on your desktop called document01 could actually be a malicious executable with an. System Filename Extensions In a Finder window, select the file for which you want to hide the filename extension.
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If that still does not work, you may have to contact the associated software developer to find out how to open it. Because many programs packages utilize Misc Files, you might be able to find a program on your computer that handles those types of files. Most likely, you will find that UNKNOWN files are considered Misc Files. Find the file in Finder, right-click (Control-click) on it, select Get Info from. Using a Windows PC, you can right-click and navigate to "Properties" and then to "Type of file". View & change file extensions for certain files or file types. If you can't download software, or if it doesn't work to open your UNKNOWN file, you may be able to use the file type as a clue to finding out how you can open it.
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Step 2: Learning More About UNKNOWN "File Type" Contact the file owner or the person who gave you the file for the password and unzip the file before attempting to open the contents. Locate the icon for the file whose extension you want to change using the Finders toolbar, Finders find command or Spotlight search utility, according to your. Zipped files tend to require special handling and may require password access.