After short googling for OPML file type, I was able to find this web site, where one can download and install a Mozilla Firefox plugin that will enable export of all your bookmarks into a file of OPML type.
The next step is to upload the file using the local file option under links management/import links. My file was about 70KB. When I tried the upload using the upload form, I have received an error message that the file size exceeds the MAX_FILE_SIZE of the upload form.
There are at least 2 ways to handle this:
- One is to open the OPML file, which is actually an XML file, and break it into a smaller chunks.
- The other option is (that is what I did) to change the MAX_FILE_SIZE of the upload form.
Simply open /wp-admin/link-import.php in your WordPress directory and find the following line of code:
input type="hidden" value="30000" name="MAX_FILE_SIZE"
Change the value to allow for the upload of the file size that you have. I changed it to 100000. Save file, and refresh your browser.Try to upload the OPML file again. Mine was uploaded just fine.