July 22 (Reuters) - Wall Street’s main indexes opened subdued on Thursday after data showed an unexpected rise in weekly jobless claims, while a steady flow of positive earnings reports offered markets some support. The Dow Jones Industrial Average rose 1.7 points, or flat, at the open to 34799.68. The S&P 500 rose 2.6 points, or 0.06%, at the open to 4361.27, while the Nasdaq Composite rose 20.8 points, or 0.14%, to 14652.724 at the opening bell. (Reporting by Devik Jain in Bengaluru; Editing by Maju Samuel) Our Standards: The Thomson Reuters Trust Principles.