In the question we are provided with a file with “Extension Error” after checking itsheader file, It was really clear it is a GIF file.
![image](https://user-images.githubusercontent.com/76834257/229889683-af7e9645-3268-42b9-b626-d594c20a747f.png)
Converting this file to GIF will show result like this,
![image](https://user-images.githubusercontent.com/76834257/229889791-f30ddbbf-6cb4-4392-9f50-ddf90b4bfc8e.png)
After checking some data related to this GIF like strings, frames, and steghide I checked
its metadata and got a string in comments which was in base64 format.
dmlzaHdhQ1RGe3ByMDczYzdfdXJfM1gxRn0=
Decrypting this to plain text got me to the Flag.
```FLAG: vishwaCTF{pr073c7_ur_3X1F}```