Microsoft Word's native file formats are denoted either by a .doc or .docx file extension; .dot and .dotx extensions are used for templates; visual basic macro-enabled documents and templates are defined by .docm or .dotm extensions starting from Word 2007.
.doc and .dot files are OLE structured storage files in the Binary File Format. The format is used by Word 97-2003 and there is still great number of such files available and most Office suits are capable of reading and creating them.
.docx, .dotx, .docm, .dotm are based on Office Open XML (WordProcessingML) format and basically are set of zip-archived xml files. The format has been introduced with Word 2007 and used in Word 2007-2013. Password protected Office Open XML file is stored as OLE container with the actual file encrypted and attached.
VBA projects can be saved as part of most of the formats, although VBA projects can be considered as "independent" attachment.
Below you can find Thegrideon Software tools designed for Word documents and templates as well as VBA Projects with basic information about protection strength and recovery methods available.

MS Word 97 - 2003
File Types:	*.doc, *.dot, ...
Protection:	There are two levels of protection available in MS Word 97 - 2003:  password protection with password to open,  write-protection (write-reservation) password.
Strength:	Password to open can be removed with guarantee.  Write-protection password is recoverable instantly.
Tool:	WordDecryptor

MS Word 2007 / 2010 / 2013
File Types:	*.docx, *.dotx, ...
Protection:	There are two levels of protection available in MS Word 2007 - 2013:  password protection with password to open,  write-protection (write-reservation) password.
Strength:	Password to open is based on strong AES encryption, thus exhaustive (brute-force) password search is required.  Write-protection password can be removed instantly.
Tool:	Word Password Recovery

VBA Projects
File Types:	*.doc, *.dot, *.docm, *.dotm, ...
Protection:	VBA Projects (macros) password protection - password to open VB code.
Strength:	VBA Project password protection can be bypassed instantly.
Tool:	VBA Password Bypasser