A base64 file extension is related to the Base64 file format.

Detailed description

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BASE64 file extension - Base64 file format

What is base64 file? How to open base64 files?

File type specification:

Encoded and encrypted file type icon Encoded and encrypted file type

The base64 file extension is related to Base64 encoded scheme that represents binary data in an ASCII string format by translating it into a radix-64 representation. 

MIME types:

Help how to open:

Probably can be accessed only using specialized programs or utilities.

How to convert:

There is probably no real way how you can convert this particular file type to anything else.

Related links:

About Base64 on Wikipedia

About RFC2045

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