File with a .UUE filename extension contains data encrypted with the Unix uuencode program, converting binary files into text files. File contains text data, that represents binary data, which enables secure transmission of them, for example through email, usually between Unix type systems (UUE – Unix to Unix Encoding).

In order to open a UUE file, first, it has to be decoded, for example utilising web browser tools, such as Web Utils Online - UUEncoder or UUDecoder Tool, from program’s website, or simply with uudecode.