Change a sniper spy module from exe to a FUD extension

I need to send a gmail attachment to a remote computer used by my partner. This gmail will have several attached files, mostly images or websites, but it also needs to include a sniper spy remote deployment module that when opened will be FUD (fully undetectable) to all anti-virus software, windows defender and google chrome. I need the exe changed to another extension that will make this possible, basically not letting my partner or gmail or any anti virus software basically barely even the computer know that sniper spy is being executed and installed and will then be monitoring the computer. I would just handle this locally but I am out of town right now and every day lost...etc. If this is possible I would be so grateful, and no this is not to be used for any illegal activities I already double checked. Thanks again for your time, -s