Messageboxes - notify on incorrect extension

[user0]

XnViewMP 1.6.5
Windows11 (23H2), display resolution 3840x2160, dpi scale 150%

Messageboxes
there is no any indication that opened image has incorrect extension, eg attached GIF image has PNG extension

test_img_gif_with_png_ext.zip

(44.93 KiB) Downloaded 87 times

Suggestion

• add new messagebox to
  - notifying user that file extension does not match file signature AND
  - offer to rename file extension

Example

• IrfanView

  

  msg_rename_extension_irfanview.png (5.75 KiB) Viewed 601 times

Related

• suggestions
  Messageboxes - notify on incorrect extension (current post)
  Messageboxes - notify on mismatched X/Y DPI
  - done -
  Messageboxes - position - Save session dialog (1.8.7)
  Messageboxes - improve Draw, Catalog dialogs (1.7.0)
  Viewer - deletion routine - add new single dialog for dirty file (1.7.0)
  Messageboxes - unify design (1.6.5)