I've create a bootstrapper installer using the Wix Extended Bootstrapper Application.  Everything works great as long as the exe has been copied to the local machine.  If the exe is located on a network share, the bootstrapper always fails.  Any ideas?  I've pasted in the relevant portion of the install log.

[0B98:0AF4][2012-11-06T16:28:56]: Planned package: NetFx40Compressed, state: Absent, default requested: Present, ba requested: Present, execute: Install, rollback: None, cache: Yes, uncache: No, dependency: None[0B98:0AF4][2012-11-06T16:28:56]: Planned package: VC2008x86, state: Absent, default requested: Absent, ba requested: Absent, execute: None, rollback: None, cache: No, uncache: No, dependency: None[0B98:0AF4][2012-11-06T16:28:56]: Planned package: VC2008x64, state: Absent, default requested: Present, ba requested: Present, execute: Install, rollback: Uninstall, cache: Yes, uncache: No, dependency: None[0B98:0AF4][2012-11-06T16:28:56]: Planned package: VC2010x86, state: Absent, default requested: Absent, ba requested: Absent, execute: None, rollback: None, cache: No, uncache: No, dependency: None[0B98:0AF4][2012-11-06T16:28:56]: Planned package: VC2010x64, state: Absent, default requested: Present, ba requested: Present, execute: Install, rollback: Uninstall, cache: Yes, uncache: No, dependency: None[0B98:0AF4][2012-11-06T16:28:56]: Planned package: RegUtil, state: Absent, default requested: Present, ba requested: Present, execute: Install, rollback: Uninstall, cache: Yes, uncache: No, dependency: Register[0B98:0AF4][2012-11-06T16:28:56]: Planned package: NeoBatchDeveloper, state: Absent, default requested: Present, ba requested: Present, execute: Install, rollback: Uninstall, cache: Yes, uncache: No, dependency: Register[0B98:0AF4][2012-11-06T16:28:56]: Plan complete, result: 0x0[0B98:0AF4][2012-11-06T16:28:56]: Apply begin[04A4:0FD8][2012-11-06T16:29:02]: Creating a system restore point.[04A4:0FD8][2012-11-06T16:29:12]: Created a system restore point.[04A4:0FD8][2012-11-06T16:29:12]: Caching bundle from: 'C:\Users\THOFFM~1.GTS\AppData\Local\Temp\{71429b2c-9594-4ca1-96dd-025d8ce017fc}\.be\NeoBatchDeveloperInstaller.exe' to: 'C:\ProgramData\Package Cache\{71429b2c-9594-4ca1-96dd-025d8ce017fc}\NeoBatchDeveloperInstaller.exe'[04A4:0FD8][2012-11-06T16:29:12]: Registering bundle dependency provider: {71429b2c-9594-4ca1-96dd-025d8ce017fc}, version: 3.2.4692.40330[04A4:0880][2012-11-06T16:33:04]: Verified acquired payload: NetFx40Compressed at path: C:\ProgramData\Package Cache\.unverified\NetFx40Compressed, moving to: C:\ProgramData\Package Cache\58DA3D74DB353AAD03588CBB5CEA8234166D8B99\dotNetFx40_Full_setup.exe.[0B98:0E20][2012-11-06T16:33:04]: Acquiring package: VC2008x64, payload: VC2008x64, copy from: \\gthyperv1\neobuilds\NeoBatch\DevBuilds\NeoBatch_Release_Dev\NeoBatch_Release_Dev_20121105.3\Bootstrapper\Release\vcredist_x64.exe[0B98:0E20][2012-11-06T16:33:09]: Setting string variable 'WixBundleLastUsedSource' to value '\\gthyperv1\neobuilds\NeoBatch\DevBuilds\NeoBatch_Release_Dev\NeoBatch_Release_Dev_20121105.3\Bootstrapper\Release\'[04A4:0880][2012-11-06T16:33:09]: Error 0x80070490: Failed to find expected public key in certificate chain.[04A4:0880][2012-11-06T16:33:09]: Error 0x80070490: Failed to verify expected payload against actual certificate chain.[04A4:0880][2012-11-06T16:33:09]: Error 0x80070490: Failed to verify signature of payload: VC2008x64[04A4:0880][2012-11-06T16:33:09]: Failed to verify payload: VC2008x64 at path: C:\ProgramData\Package Cache\.unverified\VC2008x64, error: 0x80070490. Deleting file.[04A4:0880][2012-11-06T16:33:09]: Error 0x80070490: Failed to cache payload: VC2008x64[0B98:0E20][2012-11-06T16:33:09]: Failed to cache payload: VC2008x64 from working path: C:\Users\THOFFM~1.GTS\AppData\Local\Temp\{71429b2c-9594-4ca1-96dd-025d8ce017fc}\VC2008x64, error: 0x80070490.[0B98:0E20][2012-11-06T16:33:09]: Application requested retry of payload: VC2008x64, encountered error: 0x80070490. Retrying...[0B98:0E20][2012-11-06T16:33:12]: Acquiring package: VC2008x64, payload: VC2008x64, copy from: \\gthyperv1\neobuilds\NeoBatch\DevBuilds\NeoBatch_Release_Dev\NeoBatch_Release_Dev_20121105.3\Bootstrapper\Release\vcredist_x64.exe[04A4:0880][2012-11-06T16:33:16]: Error 0x80070490: Failed to find expected public key in certificate chain.[04A4:0880][2012-11-06T16:33:16]: Error 0x80070490: Failed to verify expected payload against actual certificate chain.[04A4:0880][2012-11-06T16:33:16]: Error 0x80070490: Failed to verify signature of payload: VC2008x64[04A4:0880][2012-11-06T16:33:16]: Failed to verify payload: VC2008x64 at path: C:\ProgramData\Package Cache\.unverified\VC2008x64, error: 0x80070490. Deleting file.[04A4:0880][2012-11-06T16:33:16]: Error 0x80070490: Failed to cache payload: VC2008x64[0B98:0E20][2012-11-06T16:33:16]: Failed to cache payload: VC2008x64 from working path: C:\Users\THOFFM~1.GTS\AppData\Local\Temp\{71429b2c-9594-4ca1-96dd-025d8ce017fc}\VC2008x64, error: 0x80070490.[0B98:0E20][2012-11-06T16:33:16]: Application requested retry of payload: VC2008x64, encountered error: 0x80070490. Retrying...[0B98:0E20][2012-11-06T16:33:19]: Acquiring package: VC2008x64, payload: VC2008x64, copy from: \\gthyperv1\neobuilds\NeoBatch\DevBuilds\NeoBatch_Release_Dev\NeoBatch_Release_Dev_20121105.3\Bootstrapper\Release\vcredist_x64.exe[04A4:0880][2012-11-06T16:33:23]: Error 0x80070490: Failed to find expected public key in certificate chain.[04A4:0880][2012-11-06T16:33:23]: Error 0x80070490: Failed to verify expected payload against actual certificate chain.[04A4:0880][2012-11-06T16:33:23]: Error 0x80070490: Failed to verify signature of payload: VC2008x64[04A4:0880][2012-11-06T16:33:23]: Failed to verify payload: VC2008x64 at path: C:\ProgramData\Package Cache\.unverified\VC2008x64, error: 0x80070490. Deleting file.[04A4:0880][2012-11-06T16:33:23]: Error 0x80070490: Failed to cache payload: VC2008x64[0B98:0E20][2012-11-06T16:33:23]: Failed to cache payload: VC2008x64 from working path: C:\Users\THOFFM~1.GTS\AppData\Local\Temp\{71429b2c-9594-4ca1-96dd-025d8ce017fc}\VC2008x64, error: 0x80070490.[04A4:0880][2012-11-06T16:33:23]: Removing cached package: NetFx40Compressed, from path: C:\ProgramData\Package Cache\58DA3D74DB353AAD03588CBB5CEA8234166D8B99\[0B98:0AF4][2012-11-06T16:33:23]: Error 0x80070490: Failed while caching, aborting execution.[04A4:0FD8][2012-11-06T16:33:23]: Removed bundle dependency provider: {71429b2c-9594-4ca1-96dd-025d8ce017fc}[04A4:0FD8][2012-11-06T16:33:23]: Removing cached bundle: {71429b2c-9594-4ca1-96dd-025d8ce017fc}, from path: C:\ProgramData\Package Cache\{71429b2c-9594-4ca1-96dd-025d8ce017fc}\[0B98:0AF4][2012-11-06T16:33:23]: Apply complete, result: 0x80070490, restart: None, ba requested restart:  No

Does this happen with the standard BA? I could be a permissions issue with the share, I am not sure what access rights Burn needs. I think this is more likely to be an issue with Burn rather than this extension, may the WiX users group can help.