Sun Microsystems Inc is to acquire at least 20% of Philippine Systems Products Inc, the local distributor of Sun workstations. Sun says it will also soon open offices in China, Bangkok, Thailand and India, and new headquarters will also be set up in Seoul and Hong Kong. The company declined to reveal the cost of the Filipino stake or to say how much the expansion across Asia will cost. Philippine Systems recently received a $33m contract to set up a computer system for the Bureau of Internal Revenues.Among its clients in Manila are Citibank, Asian Development Bank, Texas Instruments and Far East Bank & Trust Co, Sun noted.