What you're likely looking for:
CK13i_xxxx_Generic.ssw)..ssw firmware file into the flash tool.The Sony Ericsson CK13i (also known as the Sony Ericsson txt) is a feature phone released in 2011 running on the PNX-4910 chipset. Because it is a legacy device, official support from Sony (formerly Sony Ericsson) has been discontinued. Pre-Requisites for Flashing sony ericsson ck13i flash file z full
If you actually meant you want to read the contents of a flash file as plain text — that's not possible directly; it's binary code. You would need to disassemble or extract it with specific tools (e.g., unssw or SonyEricssonDecryptor). What you're likely looking for: