IrfanView 4.44 32 bit does not see the CanoScan Lide 90 TWAIN driver and offers only the WIA-WIA driver. A workaround is to Run as Administrator when IV 4.44 32 bit sees both the TWAIN driver and the WI_WIA driver.
IrfanView 4.44 64 bit sees both the TWAIN and the WIA-WIA drivers. This suggests something is different between the two versions.
Windows 7 Home Edition 64 bit - HP Pavilion dual Intel CPU. I suspect the problem was introduced sometime after IV 3.6.
Background
1. See File > Select Scan / TWAIN Source does not see Canon CanoScan LiDE Scanner thread for my description of the problem and diagnosis.
2. I have previously always run IV 32 bit and IrfanView has for many, many years seen the TWAIN driver. I am 99% certain TWAIN was originally a 32 bit driver but, in trying to diagnose the problem, I installed the latest CanoScan 64 bit TWAIN driver. IV 64 bit sees this 64 bit TWAIN driver. IV 32 bit does not see it ... but does see it when IV 32 bit is Run As Administrator.
3 See Canon Scangear missing from TWAIN list in Irfanview + Paint.net but not MS Imaging? for an earlier thread where a workaround was to run IrfanView in XP Compatibility mode. I have shown it is not necessary to be in XP Compatibility Mode as Run As Administrator, without being in XP Compatibility Mode, fixes the problem.
IrfanView 4.44 64 bit sees both the TWAIN and the WIA-WIA drivers. This suggests something is different between the two versions.
Windows 7 Home Edition 64 bit - HP Pavilion dual Intel CPU. I suspect the problem was introduced sometime after IV 3.6.
Background
1. See File > Select Scan / TWAIN Source does not see Canon CanoScan LiDE Scanner thread for my description of the problem and diagnosis.
2. I have previously always run IV 32 bit and IrfanView has for many, many years seen the TWAIN driver. I am 99% certain TWAIN was originally a 32 bit driver but, in trying to diagnose the problem, I installed the latest CanoScan 64 bit TWAIN driver. IV 64 bit sees this 64 bit TWAIN driver. IV 32 bit does not see it ... but does see it when IV 32 bit is Run As Administrator.
3 See Canon Scangear missing from TWAIN list in Irfanview + Paint.net but not MS Imaging? for an earlier thread where a workaround was to run IrfanView in XP Compatibility mode. I have shown it is not necessary to be in XP Compatibility Mode as Run As Administrator, without being in XP Compatibility Mode, fixes the problem.
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