Downloaded .deb safe?

[Nigel Ridley]

How does one make sure that a downloaded .deb is safe? I mean, how does one make sure that 
there are no malicious payloads etc.?
The file in question is the winff-0.41-i386.deb downloaded from:
http://www.winff.org/

It looks like a very useful app (for my daughter's 'chipod' (Chinese MP4)) but I want to 
make sure it is safe before installing it.

Blessings,

Nigel

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