File Type Generic IconUnknown File Type
File Format Standard
Usage Open manually
Rank ★ ★ ☆  Average

If you have a file that has an UNKNOWN file extension, it does not have a known file association. Therefore, you cannot open the file by double-clicking it.

If the file is a text file, you may be able to open it using a text editor. If it is saved in a binary format, a text editor will not be able to correctly display the file's contents. Therefore, you may need to try dragging the file to several possible applications to attempt to open it.

Open With

IconOriginal program that created the file

Updated October 19, 2009