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There are always small changes in the format from one to another.<br />
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Try saving the file in the .docx format<br />
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If that does not help then post a sample of the file here.
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There are always small changes in the format from one to another.

Try saving the file in the .docx format

If that does not help then post a sample of the file here.

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We have an application that uses text files to conduct a mail merge in Word for printing documents. When it open the MS Workd 2010 document is brings up a 'File Conversion' box, &nbsp;'Select the encoding that makes your document readable' Windows Default is set by default', when I click ok the document will carry our the mail merge correctly. &nbsp;This originally worked in Office 2003 and now we have upgraded to Office 2010. &nbsp;Is ther any way to suppress the file conversion message box? (like in Word 2003). &nbsp;<br />
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Some of the testing done to date:<br />
Open Word &gt;&nbsp;File &gt;&nbsp;Options &gt;&nbsp;Advanced &gt;&nbsp;Under ‘General’ &gt;&nbsp;Uncheck ‘Confirm file format conversion on open’ is set.<br />
I have looked into the Trust Centre Settings and have removed the 'File Block Settings' and it make no difference
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We have an application that uses text files to conduct a mail merge in Word for printing documents. When it open the MS Workd 2010 document is brings up a 'File Conversion' box,  'Select the encoding that makes your document readable' Windows Default is set by default', when I click ok the document will carry our the mail merge correctly.  This originally worked in Office 2003 and now we have upgraded to Office 2010.  Is ther any way to suppress the file conversion message box? (like in Word 2003).  

Some of the testing done to date:
Open Word > File > Options > Advanced > Under ‘General’ > Uncheck ‘Confirm file format conversion on open’ is set.
I have looked into the Trust Centre Settings and have removed the 'File Block Settings' and it make no difference

Select the encoding that makes your document readable in Word 2010

Microsoft Word is a commercial document editing program that is part of the Microsoft Office suite. It features numerous text-editing tools for creating richly formatted documents, along with tools for the use of macros in Word documents. Word's native file formats are denoted either by a .doc or .docx file extension. Plugins permitting the Windows versions of Word to read and write formats it does not natively support, such as the OpenDocument format (ODF) are available. Word can import and display images in common bitmap formats such as JPG and GIF. It can also be used to create and display simple line-art.