How to get file from attachment as 0x504B...?

Question

Database

Hello.
I get a value from the database in the field, of this form: 0x504B03041 ... etc.
I know that the file is in xlsx format.
How can the values ​​from the file be converted back to xslx?

Answer 1

0x50 - P
0x4B - K
Looks like a standard compressed file header. So just write the data to the file in binary mode.

Answer 2

Representation of initial data - in hexadecimal format. So, they need to be converted to byte representation.
xslx is a regular zip file with a 0x504B header (first 2 bytes).