These have all been downloaded from the internet, straight into the desktop app.

When I go to use the documents with or without the internet from the explorer Skydrive folder they will not open. However when I have internet access and can use the desktop app, these documents open with no problems.

The message I get is 'Adobe Reader could not open "the document name" because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't decoded right'. It doesn't matter which type of file it is they all say the same thing.

This is only happens some times, I have in the past downloaded files and not had any issues, but the last two times I have downloaded big numbers of files (one at a time though) and uploaded to Skydrive I get this message the next day when I attempt to use them.

Is there a way to fix this without having to find and re download all the files - there is a lot of them and it takes a fair amount of time.