What are the default locations for key files in Act!?

Question: What are the default locations for key files in Act!?

Product Details: 
Product Family:  Act!
Product:  Act! Pro, Act! Premium, Act! Premium (access via web)
Version: 2011 and later

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Answer: 

For the default file locations, refer to the article that pertains to your version of Act! below:

What are the default locations for key files in Act! v20?
Answer ID What are the default locations for key files in Act! v20?

What are the default locations for key files in Act! v19?
Answer ID What are the default locations for key files in Act! v19?

What are the default locations for key files in Act! v18?
Answer ID What are the default locations for key files in Act! v18?

What are the default locations for key files in Act! v17?
Answer ID What are the default locations for key files in Act! v17?

Default locations for key files in Act! v16
Answer ID Default locations for key files in Act! v16

Default Locations for Key Files in Sage ACT! 2013
Answer ID Default Locations for Key Files in Sage ACT! 2013

Default Locations for Key Files in Sage ACT! 2012
Answer ID Default Locations for Key Files in Sage ACT! 2012

Default Locations for Key Files in Sage ACT! 2011
Answer ID Default Locations for Key Files in Sage ACT! 2011