Office 2007, updated with all Service Packs and patches. All other file extensions open fine with exception of ".doc". When opening a .doc file, (for example, "sample.doc"), I get error message that states "The command cannot be performed because a dialog box is open." Click OK, and dialog box behind it states "The file could not be found. (C:\Documents.doc)". Click OK and new box says: "This file could not be found. (C:\Documents and Settings\...\and.doc)". Click OK and new box says: "The directory name is not valid. (C:\Documents and Settings\...\sample.doc)." Click OK and document finally opens.

Can someone help resolve this issue?

Try re-registering Word as follows: Exit Word if it is currently running. Hold the Windows logo key as you press R; in the Run dialog box, type winword /r and press Enter (note that there is a space before the slash, but not after it). After Word completes re-configuration, see if things work normally.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional