[framework] post append_file kills meterpreter

Hi,

I'm writing a post module that has to append some lines at the end of a
file. I'm using Meterpreter on a Win7 machine for testing and
append_file() of Msf::Post::File for file access.

As append_file() tries to open the file the Meterpreter process dies
with c0000417 exception code.

the actual code can be found here:
https://github.com/v-p-b/MSF-Addons/blob/master/modules/post/multi/manage/firefox_install_addon.rb#L258

Is this a bug? Thanks in advance:

Balint
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