The OOXML Validator validates Office Open XML files (.docx, .docm, .dotm, .dotx, .pptx, .pptm, .potm, .potx, .ppam, .ppsm, .ppsx, .xlsx, .xlsm, .xltm, .xltx, or .xlam ...
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You must file your Part XVIII and Part XIX information return electronically by using the CRA Internet file transfer (XML) or Web Forms applications. To find out when these applications are available, ...