File names and extensions
In content for Windows and the Mac, use title capitalization for file names, folders, and drive names. Use all lowercase for extensions.
Microsoft style
.htm file
C:\Taxes\April2010
My Tax File, 2010
It is all right to use internal capitalization for readability in concatenated file names if they cannot be confused with function names.
Microsoft style
MyTaxFile
Mytaxfile
Do not use the file name extension to identify the type of file under discussion unless you have no other choice. Use more descriptive language instead.
Microsoft style
A Microsoft Excel workbook contains one or more spreadsheets. Store the result as a text file.
Not Microsoft style
An .xlsx file contains one or more spreadsheets. Store the result as a .txt file. ...
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