Ich habe eben ein Foto gekauft und downgeloaded. Es hat die die Endung .ai, die sich nicht öffnen lässt.
.ai is not a photo. It's a vector image to open in Adobe Illustrator.
Thanks for reaching out to the Adobe Stock community.
In addition Anna%20Lander reply, I would like to let you know that vector files work the best with Illustrator only but can be used in Photoshop as a rasterised image.
However, if you do not have Illustrator, rather than subscribing the app you can always use the7-day trial version(in order to use the vector file you have downloaded from Adobe Stock).
You may use this link to download the trial version of Illustrator: Download a free trial or buy Adobe products | Adobe free trials & downloads
Hope this information helps!
Feel free to update this thread in case of any additional questions.