Would you mind if I opened the window?

[Snappy]

"Would you mind if I opened the window?" is found for the usage of the word "mind" in Longman Dictionary of Contemporary English. The dictionary explains that it is spoken and used when making a polite request.
In the same dictionary, "Would you mind if I open a window?" is also found for the usage of the word "mind."
Are these both acceptable and the same in meaning?
"Would you mind if I opened the window?"
"Would you mind if I open the window?"

[svartnik]

Both are possible.

[engee30]

"Would you mind if I opened the window?" is found for the usage of the word "mind" in Longman Dictionary of Contemporary English. The dictionary explains that it is spoken and used when making a polite request.
In the same dictionary, "Would you mind if I open a window?" is also found for the usage of the word "mind."
Are these both acceptable and the same in meaning?
"Would you mind if I opened the window?"
"Would you mind if I open the window?"

Both are possible.

It's only either Would you mind if I opened the window? or Do you mind if I open the window? that is correct.

[Raymott]

"Would you mind if I opened the window?" is found for the usage of the word "mind" in Longman Dictionary of Contemporary English. The dictionary explains that it is spoken and used when making a polite request.
In the same dictionary, "Would you mind if I open a window?" is also found for the usage of the word "mind."
Are these both acceptable and the same in meaning?
"Would you mind if I opened the window?"
"Would you mind if I open the window?"

I could only find one mention in the Longman Dictionary of Contemporary English of this example under 'mind'. "Would you mind if I opened the window?"
Did you make a mistake in your question?

Anyhow, I agree with engee.

[svartnik]

Both are possible, guys.

Would you mind if I opened the window?

http://www.usingenglish.com/forum/as...u-mind-if.html

http://www.usingenglish.com/forum/as...u-mind-if.html

[bhaisahab]

Both are possible, guys.

Would you mind if I opened the window?

http://www.usingenglish.com/forum/as...u-mind-if.html

http://www.usingenglish.com/forum/as...u-mind-if.html

These links seem to prove one thing, that in AmE both are accepted by some, but are not necessarily acceptable to all.

[svartnik]

not necessarily acceptable to all.

Which part proves that?

[svartnik]

Would you mind if I smoke? - WordReference Forums

[engee30]

Svartnik, it's not how many reference links you provide, but it's what you think that is right. I'm a prescriptivist, so I should strongly recommend saying that following the patterns:
would mind if + past tense
do mind if + present tense

[svartnik]

I'm a prescriptivist,

Being a prescriptivist suggests having absolute authority in the English language to me, eng. No offence, but who are you?
Okay, I rephrase my answer and say, both are commonly used by educated people.

PS: and please ... do not ... underline ... my name, please. I can see very well. ;)