I will/would appreciate your sending me the file.

[Kontol]

I want to ask someone to send me a file, but I am not sure which one is "will" or "would" more appropriate?

I will appreciate your sending me the file.
I would appreciate your sending me the file.

 

[tedmc]

Both are correct, but #2 sounds a bit more polite.

 

[5jj]

I would appreciate your sending me the file.

That's the one.