MS Office 07 excel ".xlsx" file Tika 1.4 api is detecting wrong mimetype.

I am using Tika 1.4 jars for standard alone project.
While running from eclipse Tika 1.4 jars detecting correct mimetype,
I build jar file from my project and running my standalone project from command prompt its detecting wrong mimetype.
I am attaching my code
Parser parser = new AutoDetectParser();
InputStream stream = new FileInputStream(file);
int writeUnlimited = -1;
ContentHandler contentHandler = new BodyContentHandler(writeUnlimited);
Metadata metadata = new Metadata();
parser.parse(stream, contentHandler, metadata, new ParseContext());
mimeType = metadata.get(Metadata.CONTENT_TYPE);
logger.info("Correct MimeType value for '" + file.getName() + "' file is: " + mimeType);
Output from eclipse is
Correct MimeType value for 'CIQ_83517.xlsx' file is: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Output from command prompt
Correct MimeType value for 'CIQ_83517.xlsx' file is: application/x-tika-ooxml

I have only tika 1.4 and its dependent jar files.
Is it issue with my code or tika1.4 jar has some issue?
Iam using java 1.6 version.

Thanks for your help