COSMO Files: What to Do If You Don't Have Unknown Apple II File Software

Unknown Apple II File is typically associated with binary COSMO files, so you might be mistaken for thinking that program is the only way to open a file with a COSMO extension.

Either way, if you're stuck with a COSMO file you absolutely have to open, keep on reading. We'll show you how to open it, even if you don't have Unknown Apple II File software installed on your system.

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Opening COSMO Files without Unknown Apple II File

Different software packages tend to sometimes share similar file types. Unknown Apple II File is one of the popular programs that use the COSMO file extension, so you should be able to use it to open your file. You might even be able to find others by doing a quick Google search.

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A word of warning, though. Be sure to scan any free software you download with a malware checker before running it on your computer.

If You Have Unknown Apple II File Installed

If this software package is already installed on your PC, but it still won't work to open your COSMO file, you might have to check that the file associations are correct. Right-click on the file, select "Open With..." and then select Unknown Apple II File. That will create an association between the COSMO file extension and your chosen software.

Your COSMO Might Be Corrupt

Finally, if you're still having issues opening your COSMO file, download the file again or ask the sender to resend it. It's possible that your COSMO file might be corrupt. As a last resort, contact the software developers to see if they may be of further assistance.

Here's a list of COSMO-related software programs and their developers:

Software Developer
Unknown Apple II File found on Golden Orchard Apple II CD Rom

The Easiest Way to Open COSMO File Extensions

Don't want to spend money on buying software to use it only once? Save yourself the trouble of installing unwanted software simply to view the occasional COSMO file by downloading a universal software viewer such as File Magic [download] instead. File Magic allows you to open and view hundreds of different file types with one program. Download File Magic now and try it for yourself.


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