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Get workbook path only

Generic formula 
=LEFT(CELL("filename",A1),FIND("[",CELL("filename",A1))-1)
Summary 

If you want to get the workbook path (directory) only, you can do so with a formula that uses the LEFT and the FIND function. The result will look something like this:

Drive:\path\to\file\   //Windows
Drive:path:to:file:    //Mac
Explanation 

The cell function is used to get the full file name and path:

CELL("filename",A1)

The result looks like this:

path[workbook.xlsm]sheet

The full file name and path are fed into the LEFT function, which is used to extract just the full directory path.

The number of characters to extract by locating the the position of the left square bracket "[" with FIND and subtracting 1:

FIND("[",CELL("Filename",A1))-1
Author 
Dave Bruns
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