was unable to open document

[thomas615]

Is this sentence all right? which sentence is clearer?

I was not able to open the document that you emailed to me.

I could not open the document that you emailed to me.

[Barb_D]

Both are fine.

You could, by the way, omit "to."

[emsr2d2]

Both are fine.

You could, by the way, omit "to."

In the first example, that's the second "to" that could be omitted, not the first.