Question: Include a maple file in another

In the same directory I have two Maple files. SignExpAlg.mw and RootBox.mw

In SignExpAlg.mw I have written several procedures which I am wanting to use in RootBox.mw

I have tried to do

    read "SignExpAlg.m"

at the top of RootBox but when I click !!! I get the error message: "Error, could not open 'SignExpAlg.m' for reading"

What am I doing wrong?

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