Pre-v5.9-client, upgrade 64-bit, change 32-bit, deletes all still-present pre-v5.9-work.

[Rattledagger]

Old clients don't include the "platform"-tag on applications and results, while v5.10.xx on startup fills-in with the primary-platform-tag if none present.

Meaning, if you're trying-out 64-bit client 1st., all applications/versions will be marked as <platform>windows_x86_64</platform>

If you later switches-back to 32-bit client, any 64-bit results will immediately be deleted with an

2007-06-11 16:26:08 [BOINC alpha test] [error] App version has unsupported platform windows_x86_64 2007-06-11 16:26:08 [BOINC alpha test] [error] No app version for result: windows_x86_64 515

Since many projects including CPDN still haven't upgraded their server to handle 64-bit clients, it's likely many that will install 64-bit, for so switching to 32-bit to report results or continue Trickling... But, this means CPDN-wu's is deleted...

Upgrading to 32-bit client 1st. would not give the same effect, but, any newly-downloaded work marked as 64-bit would also get deleted. Only if project sends work using "alt_platform" can you really safely switch-back from 64-bit to 32-bit.