Notes about the FEN file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The FEN file type is primarily associated with 'FileEncryptor' by ARXsoft Co., Ltd.. The .FEN extension is added to the end of the original file's name. Encrypted file with maximum protected algoritm AES(Rijndael).