Is pg_dump.exe dose not need -i parameter?

Hi,good night!
When I use pgAdmin 1.8.4 (the postgres GUI tool),discovered that the tool's backup command miss a parameter "-i",
ex:
pg_dump.exe -h localhost -p 5432 -U postgres -F c -b -v -f "C:\Users\hp\Desktop\test.backup" itask5s

I found that pgAdmin alwaws appends "-i" args below the command above,of course with pgAdmin 1.6.3 or even early versions. But, miss "-i" this will result in export command invalidation, pg_dump.exe execution can't coninue, I fill maybe really something forgotten.Is that sure?

Thank you,best wishes.

（1.8.?系列版本的pgAdmin3工具备份数据库的命令参数似乎漏了-i，导致无法备份数据库，因为提示pg的版本同pgadmin的pg_dump版本不一致，只得在命令行（dos environment）拷贝上述命令并加上-i，备份才成功。而以前的pgadmin备份命令均带有-i参数，也许是出于其它考虑，你们（辛勤的开发团队）才略去了pg_dume.exe 的-i参数。)