PHOTOSHOP NO ME RECONOCE .GIF y .PNG

Hola, lo primero como no, saludaros a todos ya que es la primera vez que escribo.
En segundo lugar, me gustaría comentaros que tengo un problema con photoshop y los archivos .gif y .png, no se si es un problema de la instalación del programa ya que nunca antes habia tenido este tipo de problemas. Comentaros que trabajo en un ordenador mac desde hace muy poco por lo que no domino esta plataforma, en PC nunca me habia ocurrido. El problema es un mensaje que me dice que no reconoce este tipo de archivos.... (.GIF y .PNG) ya dudo en si puede ser alguna opción que haya que activar en preferencias (cosa que dudo) pero bueno, por si acaso.
Muchas gracias por adelantado.
Un saludo.

Muchas gracias Juan, mira, el mensaje que me dice es este...
"No se ha podido cumplir porque Photoshop no reconoce este tipo de archivos".
Me lo hace con los archivos .GIF y .PNG pero cada vez estoy más convencido de que es un fallo de la instalación, no creo que sea una versión capada ni nada por el estilo...
Un saludo.

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