Opening files in email

[kpinks]

I have an Iphone4 and just love this phone! I received an email the other day with a PDF in it. I tried to open the file, which then took me to a screen of apps that can open the file. I clicked on several of the icons and it said something like " unknown file format, .flv file "
How can I fix this?
Thanks

 

[willerz2]

Do you have iBooks installed? iBooks by default can open PDF files.