While there is no official PPSPP URL defined yet, the following simple structure has been used, based off a quick reading of Guidelines for new URL Schemes and URI Generic Syntax.

The keys and values used for the optional query string are the lower-case versions, with whitespace replaced by underscores, of those referred to in PPSPP section 7 and the canonical PPSPP IANA registry.

Some examples are:

Comments and suggestions to improve this are welcomed.