There[SQ]s no standard Windows application officially called "Win Catalog." It[SQ]s possible :

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It[SQ]s a typo:

Perhaps you meant a similar-sounding program, like a cataloging program for Windows (e.g., a software inventory tool, a library cataloger, a game cataloger, etc.). If you can remember any other details about the program, it would help to identify it.
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It[SQ]s a third-party application:

Many third-party software programs exist with names similar to "Win Catalog." These could be anything from simple list-making tools to sophisticated database applications for managing collections.
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It[SQ]s an internal application:

It might be a custom application created for a specific company or organization.

To help me find out what "Win Catalog" refers to, please provide more information, such as:

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Where did you hear about it?

(website, manual, conversation)
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What is its purpose?

(What kind of things does it catalog?)
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What does the program[SQ]s interface look like (if you[SQ]ve seen it)?

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Anything else you remember about it.

With more detail, I can offer a more accurate answer.