Handling binary files

[Davider]

The variable s prints as empty, Why?
I want to replace 55AA with FFFF

https://i.ibb.co/wRhZDr4/456.png

File: a.bin
https://workupload.com/file/mBmP3zeeckg

Macro Macro22

Code:

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str s.getfile("$desktop$\a.bin")
out s

;search
int i=findb(s "55AA")
out i