File names - Geomview Manual
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#### 4.1.2 File Names

When OOGL objects are read from disk files, the OOGL library uses the file suffix to guess at the file type.

If the suffix is unrecognized, or if no suffix is available (e.g. for an object being read from a pipe, or embedded in another OOGL object), all known types of objects are tried in turn until one accepts the data as valid.