.OPML File

The opml file extension is associated with OPML (Outline Processor Markup Language). OPML an XML-based format that allows exchange of outline-structured information between applications running on different operating systems and environments.

It is used to exchange subscription lists between programs that read RSS files, such as feed readers and aggregators.

The opml file contains data formatted in the outline processor markup language.

MIME types used for opml files:
application/xml
text/xml
text/x-opml

Files with opml file extension are written in the Outline Processor Markup Language. Used in RSS environment.

How to open:

As far as we know, the code from *.opml files can be viewed and edited in any text editor. However, to process these files you will need as special tool.

How to convert:

Most likely cannot be just simply converter, however export of the content to similar format is likely.