Method of IApplication
Convert path from relative to full form
var pstrPathAbsolute = Application.PathFromRelative(strPathRelative, bCheckExist);
pstrPathAbsolute = Application.PathFromRelative strPathRelative, bCheckExist
BSTR pstrPathAbsolute; HRESULT hr = Application.PathFromRelative(strPathRelative, bCheckExist, &pstrPathAbsolute);