Files with undefined file extension can be usually found as renamed files that were not recognized by their programs during some loading or generating process.

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UNDEFINED file extension - Undefined data

What is undefined file? How to open undefined files?

File type specification:

Various data file type icon Various data file type

The undefined file extension is sometimes used by programs to label files whose origin or purpose is not clear.

These can be for example generated by file recovery systems that fail to recognize the file formats.

Help how to open:

It may be possible that some undefined files can be only accessed with the program that generated them.

How to convert:

Perhaps some undefined files may be converted, but we do not know about any such conversion at this time.

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